Multi-wavelength laser frequency doubling device and multi-wavelength space laser modulation deviceTechnical Field
The invention belongs to the technical field of laser application, relates to a laser modulation technology, and in particular relates to a multi-wavelength laser frequency doubling device and a multi-wavelength space laser modulation device.
Background
Multi-wavelength laser refers to generating or combining laser outputs of multiple different wavelengths simultaneously, which breaks through the traditional single wavelength limitation. The multi-wavelength laser has the advantages of wide wavelength adjustment range, enhanced optical power output, reduced system complexity, improved working efficiency and cost benefit, strong adaptability and the like, and is continuously expanded in a plurality of application fields. In the field of communication, the multi-wavelength laser can support more channels to provide larger data transmission capacity, in the field of environmental monitoring, the multi-wavelength laser can perform more accurate pollutant detection, in the field of material science and life science, the multi-wavelength laser can perform multi-dimensional analysis, and the multi-wavelength laser is beneficial to revealing more complex physical and chemical phenomena and the like. Therefore, multi-wavelength lasers will be one of the important directions of future laser technology development.
Laser frequency multiplication is one of the key technologies for multi-wavelength laser modulation. In the conventional solid and gas laser field, frequency multiplication of laser is often only performed on single-wavelength laser, and it is often difficult to perform the above processing on multiple-wavelength laser by the same system. The common practice is to perform frequency multiplication, amplification and shaping on the single-wavelength laser, and then perform beam combination treatment on the single-wavelength laser. The single-wavelength laser has the advantages that each single-wavelength laser has an independent light path structure, and the subsequent multi-source laser beam combining light path structure is added, so that the final multi-wavelength laser light path structure is complex and huge, the number of components is large, the cost is high, and the subsequent system application is not facilitated.
In addition, laser shaping and gain amplification are key technologies for realizing multi-wavelength laser adjustment. Similarly, similar to the existing laser frequency doubling technology, the current laser shaping and gain amplification are mainly aimed at single-wavelength lasers. At present, no multi-wavelength laser modulation technology for simultaneously carrying out frequency multiplication, shaping and amplification on multi-wavelength laser exists.
The patent application document with the application number of CN202411226366.0 discloses a multi-wavelength output laser and an implementation method thereof, wherein a fundamental frequency laser with the output wavelength of fundamental frequency is adopted, the combination of a second wavelength module and a third module is adopted to realize the output of a plurality of wavelengths, and a lens is adopted to modulate the divergence angles of the lasers with the second wavelength and the third wavelength, so that the directivity and the divergence angle of the lasers with different output wavelengths are the same, and the positions of the lasers with different wavelengths, which are acted on an application terminal after entering a light guide arm, are the same and the focusing performance is the same. It can be seen that in this implementation, a corresponding number of implementation modules, e.g. a fundamental laser, a second wavelength module and a third wavelength module, need to be provided for the number of output laser wavelengths. It is expected that when faced with laser outputs of more than three wavelengths, the implementation will be quite complex and difficult to meet the application requirements.
Disclosure of Invention
Aiming at overcoming the defects in the prior art, the invention provides a multi-wavelength laser frequency doubling device which is designed into a multi-layer frequency doubling structure for the first time, can realize the frequency doubling treatment of lasers with various wavelengths at the same time, and solves the problems of redundancy design, limited application and the like of the traditional laser frequency doubling mode.
The invention further aims to provide a multi-wavelength space laser adjusting device, which is based on a designed multi-wavelength laser frequency doubling device, further integrates a multi-wavelength shaping device and a multi-wavelength gain device, realizes the effects of simultaneous frequency doubling, shaping, amplifying and the like of multi-wavelength laser, and improves the problems of redundancy, limited application and the like of a multi-wavelength laser modulation structure in the traditional laser application.
In order to achieve the above purpose, the present invention is realized by adopting the following technical scheme.
The invention provides a multi-wavelength laser frequency doubling device which comprises a base A and more than one laser frequency doubling unit, wherein two rows of first mounting grooves parallel to the length direction of the base A are formed in the two sides of the base A, each row of first mounting grooves comprises more than two clamping grooves A which are coaxially arranged, the clamping grooves A on the two rows of first mounting grooves are symmetrically arranged, the laser frequency doubling units are arranged in the clamping grooves A which are symmetrically arranged in the two rows of first mounting grooves, and each laser frequency doubling unit corresponds to laser with one wavelength and is used for carrying out frequency doubling treatment on the laser with the corresponding wavelength.
Laser frequency doubling is a nonlinear optical process by which the frequency of the laser can be doubled, thereby halving the wavelength. When the fundamental laser light having a frequency ω passes through the nonlinear crystal BBO, LBO, or CLBO, second Harmonic Generation (SHG) occurs, and laser light having a frequency 2ω, that is, frequency-doubled laser light, is generated. For example:
(1) Laser beam of 532nm can be obtained after laser beam of 1064nm output by YAG laser passes through KTP crystal. It is also possible to produce 355nm or 266nm ultraviolet light by further treatment with a third or fourth harmonic by LBO crystals or CLBO crystals.
(2) Ti is 770nm potassium (K) laser, 795nm rubidium (Rb) laser and 895nm cesium Cs laser output by the Sapphire tunable laser, and 385nm, 398nm and 448nm lasers with double frequency can be obtained through BBO crystals (beta barium borate) or LBO crystals (lithium triborate) with different crystal directions.
In one implementation mode, for multi-wavelength lasers, the effective frequency multiplication of lasers with different wavelengths and different powers is required to meet the requirements of different thicknesses of laser frequency multiplication units, the thicknesses are too small and insufficient, the thicknesses are too large, the laser power attenuation is too large, in order to meet the requirements of the effective frequency multiplication of lasers with different wavelengths and effectively control the influence of the laser power attenuation with different wavelengths, through comprehensive calculation, the width dimensions of all the laser frequency multiplication units perpendicular to the length direction of a base A are identical, the height dimensions are identical, and the range is 3-4cm wide, 1-2cm high, and the length along the length direction of the base A is 1.5-3.5cm. Each laser frequency doubling unit can transmit laser with the wavelength range of 280nm-2 μm. Each laser frequency doubling unit only carries out frequency doubling on laser with one wavelength, and does not generate frequency conversion, wavelength conversion or gain amplification except for having certain power loss on the laser with non-corresponding frequency doubling wavelength. The laser frequency doubling unit can be a frequency doubling crystal block or a transparent closed pool filled with frequency doubling media. The doubling medium may be coumarin series dye.
In one implementation manner, the first installation groove provided by the invention comprises 10 clamping grooves A, and 1-10 laser frequency doubling units can be fixed.
The first mounting groove and the base A can be fixedly connected or slidably connected, and when the first mounting groove and the base A are slidably connected, the laser frequency doubling units with different lengths can be mounted, so that different laser frequency doubling requirements can be met, and the application field of the multi-wavelength laser frequency doubling device is expanded.
In the first embodiment, the first installation groove is formed by baffle plates a which are installed at two ends of the base a in the direction perpendicular to the length direction of the base a and more than one baffle plate a positioned between the two baffle plates a, a clamping groove a is formed between the adjacent baffle plates a and the baffle plates a or between the adjacent two baffle plates a, and the design of the baffle plates a and the baffle plates a satisfies that air separation layers between the baffle plates a and the laser frequency doubling units are reduced as much as possible. The baffle A and the baffle A are respectively and fixedly connected with the base A. The heights of the baffle A and the baffle A are the same or different. Furthermore, the heights of the baffle A and the baffle A are not lower than half of the height of the laser frequency doubling unit, and are not higher than 1.5 times of the height of the laser frequency doubling unit.
In the second embodiment, the first installation groove is formed by a baffle a 'installed at two ends of the base a in a direction perpendicular to the length direction of the base a and more than one baffle a' located between the two baffles a ', a clamping groove a is formed between an adjacent baffle a' and the baffle a 'or between two adjacent baffles a', the baffle a 'is fixedly or slidingly connected with the base a, and the baffle a' is slidingly connected with the base a. The heights of the baffle A 'and the baffle A' higher than the base A are the same or different. Further, the heights of the baffle A 'and the baffle A' are not lower than half of the height of the laser frequency doubling unit, and are not higher than 1.5 times of the height of the laser frequency doubling unit.
Furthermore, L-shaped sliding grooves A are formed in two sides of the base A, scales are marked on the cantilever A above the L-shaped sliding grooves A, the partition plate A 'is integrally L-shaped and is slidably arranged in the L-shaped sliding grooves A, the partition plate A' comprises a horizontal part a and a vertical part a, a notch a which is matched with the cantilever A in height is formed in the vertical part a, the height of the horizontal part a is matched with the height of the horizontal notch A of the L-shaped sliding grooves A, the horizontal part a extends out of the horizontal notch A, and the partition plate A is locked by adjusting the handle A. The partition plate A ' and the L-shaped chute A form a sliding pair, the partition plate A ' can be rapidly positioned through scales marked on the cantilever A, and rapid locking between the partition plate A ' and the L-shaped chute A can be achieved through adjusting the handle A. And the detachable connection mode formed by the base A and the partition plate A' and the adjusting handle A ensures that the multi-wavelength laser frequency doubling device has the portable advantage and can further expand the application range of the multi-wavelength laser frequency doubling device.
The invention further provides a multi-wavelength space laser modulation device based on the multi-wavelength laser frequency doubling device, which comprises a fundamental frequency laser, a selective frequency doubling mechanism and more than one group of laser shaping and amplifying mechanisms, wherein when the laser shaping and amplifying mechanisms comprise more than two groups, all the laser shaping and amplifying mechanisms have the same structure and comprise a multi-wavelength laser shaping component and a multi-wavelength laser gain amplifying component;
the fundamental frequency laser is used for providing fundamental frequency laser with more than one wavelength;
The selective frequency doubling mechanism comprises an optical beam splitter, a frequency doubling light path and a non-frequency doubling light path which are positioned at the back two output directions of the optical beam splitter, and an optical coupler A for coupling laser generated by the frequency doubling light path and the non-frequency doubling light path, wherein the frequency doubling light path comprises a multi-wavelength laser frequency doubling device and a first multi-wavelength laser filter which are provided in any one of the realizable modes, and the first multi-wavelength laser filter is used for filtering the laser generated by frequency doubling treatment of the multi-wavelength laser frequency doubling device to obtain frequency doubling laser containing target wavelength;
The multi-wavelength laser shaping assembly comprises a three-port unidirectional transmitter, a multi-wavelength laser waveform shaper and a total reflector, wherein a laser beam input into the multi-wavelength laser shaping assembly enters the multi-wavelength laser waveform shaper through the three-port unidirectional transmitter, the multi-wavelength laser waveform shaper is used for shaping target wavelength laser in the laser beam, the shaped laser beam is reflected by the total reflector and then is shaped for the second time through the multi-wavelength laser waveform shaper, and the laser beam shaped for the second time is input into the multi-wavelength laser gain amplifying assembly through the three-port unidirectional transmitter;
the multi-wavelength laser gain amplifying assembly comprises a multi-wavelength laser gain amplifying structure and a second multi-wavelength laser filter, wherein the multi-wavelength laser gain amplifying structure is used for amplifying the power of the target wavelength laser input into the multi-wavelength laser gain amplifying assembly, and the second multi-wavelength laser filter is used for filtering the laser beam output by the multi-wavelength laser gain amplifying structure.
In one implementation, the laser wavelength range of the fundamental laser output is 280nm-2 μm. The fundamental frequency laser can be one laser or a combination of a plurality of lasers, and the output laser of the fundamental frequency laser is single-wavelength or multi-wavelength laser.
In one implementation, a selective frequency doubling mechanism is used to selectively frequency convert the fundamental laser output laser light. The fundamental frequency laser output from the fundamental frequency laser is divided into two paths by an optical beam splitter, wherein one path enters a frequency multiplication optical path, and the other path enters a non-frequency multiplication optical path. The optical beam splitter is preferably a 50:50 optical beam splitter.
Further, the frequency multiplication optical path and the non-frequency multiplication optical path are respectively provided with an optical switch, so that the selective frequency multiplication mechanism II has three switch communication modes:
(1) The selective frequency doubling mechanism is coupled and output as a laser beam which consists of fundamental frequency laser output by the fundamental frequency laser and frequency doubling laser converted by the multi-wavelength laser frequency doubling device and contains multi-wavelength target wavelength laser;
(2) The selective frequency doubling mechanism is coupled to output frequency doubling laser converted by the multi-wavelength laser frequency doubling device;
(3) And at the moment, the selective frequency doubling mechanism is coupled to output fundamental frequency laser output by the fundamental frequency laser.
The traditional frequency multiplication optical path is often used for carrying out frequency multiplication on single-wavelength laser, and the design of the multi-wavelength laser frequency multiplication device provided by the invention can realize multi-wavelength frequency multiplication. The first mounting groove designed by the multi-wavelength laser frequency doubling device can simultaneously bear a plurality of laser frequency doubling units, so that the frequency doubling light path can simultaneously realize frequency doubling treatment of lasers with various wavelengths.
Furthermore, a total reflection mirror for adjusting the laser transmission direction is arranged in the frequency multiplication light path or/and the non-frequency multiplication light path.
According to the invention, the number of the laser shaping and amplifying mechanisms is set according to the laser waveform shaping and power amplifying requirements, when a group of laser shaping and amplifying mechanisms is set, the twice waveform Gaussian shaping of laser and the once compensation and amplification of laser power or energy are realized, and when N (N is more than or equal to 2) groups of laser shaping and amplifying mechanisms are set, the 2N times waveform Gaussian shaping of laser and the N times compensation and amplification of laser power or energy are realized.
In one implementation, for a multi-wavelength laser shaping assembly, the three-port unidirectional transmitter includes ① ports, ② ports, and ③ ports, the ① ports serve as laser inputs of the multi-wavelength laser shaping assembly, the ② ports interface with one end of the multi-wavelength laser waveform shaper, and the ③ ports serve as laser outputs of the multi-wavelength laser shaping assembly. Furthermore, the three-port unidirectional transmitter is a polarization beam splitter prism PBS or a beam splitter, and the applicable wavelength range is 280nm-2 mu m.
In one implementation, the multi-wavelength laser waveform shaper gaussian shapes laser light having a wavelength in the range of 280nm-2 μm for a multi-wavelength laser shaping assembly. The multi-wavelength laser waveform shaper can perform optimized modulation on waveforms of lasers with multiple center wavelengths at the same time, is a bidirectional transmission device, and can realize Gaussian shaping on laser waveforms no matter which end the lasers are input from, thereby achieving the purpose of improving the input laser waveforms. The laser waveform shaping mainly uses a series of methods such as proper filtering, delay, amplitude adjustment and the like introduced into a circuit, so that the waveform of a laser pulse signal is changed. Typical laser waveform shaper types include liquid crystal spatial light modulators, acousto-optic tunable filters, laser pulse clipping shapers, fiber optic shapers, and the like. The laser pulse clipping shaper is an all-solid-state laser pulse clipping system, adopts a high-speed photoelectric Q switch, has rising edge and falling edge time as fast as 3ns, and is very suitable for laser pulse waveform shaping, laser pulse chopping, laser pulse clipping, regenerative amplifier switching, mode locking pulse gating, cavity emptying and Q switch application. The laser pulse clipping shaper has the advantages of reliability, lowest radiation noise, solid state, high voltage switch and the like, and is suitable for inner cavity and outer cavity application. Typical parameters for a laser pulse clipping shaper are:
(1) 250nm to 2200nm (DKDP pockels cell is suitable for 300 to 1320nm, BBO pockels cell is suitable for 250 to 1320nm, RTP pockels cell is suitable for 500 to 2200 nm);
(2) Optical rising edge time and falling edge time are about 3ns (10 mm caliber DKDP pockels cell);
(3) The optical pulse width is about 8ns-1us;
(4) The repetition frequency is 1Hz-2500Hz.
In one implementation, for a multi-wavelength laser shaping assembly, the total reflector is a total reflector with an applicable wavelength range of 280nm-2 μm and a reflection efficiency of 99.9%.
In one implementation, the multi-wavelength laser gain amplification assembly compensates and amplifies laser power or energy output via the multi-wavelength laser shaping assembly.
The design of the multi-wavelength laser gain amplification structure provided by the invention can realize multi-wavelength laser gain amplification. The multi-wavelength laser gain amplifying structure comprises a multi-wavelength laser gain amplifying device, wherein the multi-wavelength laser gain amplifying device comprises a base B and more than one laser gain unit, two rows of second mounting grooves parallel to each other in the length direction of the base B are formed in two sides of the base B, each row of second mounting grooves comprises more than two clamping grooves B which are coaxially arranged, the clamping grooves B on the two rows of second mounting grooves are symmetrically arranged, the laser gain units are arranged in the clamping grooves B which are symmetrically arranged in the two rows of second mounting grooves, and each laser gain unit is used for amplifying the power of laser in a specified wavelength range.
The laser gain amplification is based mainly on stimulated radiation processes, and amplification of the optical signal is achieved by exciting atoms or molecules in the gain medium. The excited medium (such as solid, liquid or gas) can be converted to higher energy level under the excitation of external light (provided by pumping source), and when the incident laser interacts with atoms or molecules in these excited states, the excited radiation can be generated, and photons with the same frequency, coherent phase and direction as the input laser can be generated, so that the amplification of optical signal can be implemented.
Based on the analysis, the multi-wavelength laser gain amplifying structure is also provided with pumping sources matched with the target wavelength and optical couplers B the same as the pumping sources in number, and laser emitted by each pumping source enters the multi-wavelength laser gain amplifying device together with the laser incident to the multi-wavelength laser gain amplifying structure for gain amplification after passing through the corresponding optical couplers B, and then outputs laser beams containing the laser with the target wavelength through the optical collimator. The invention has no limit to the selection of the pump sources, and can select the pump sources with the target wavelength in the corresponding working wave band, and can use one pump source for more than two target wavelength lasers with the wavelength interval absolute value smaller than 20 nm.
For multi-wavelength lasers, the thicknesses required by the effective gain amplification of the lasers with different wavelengths are different, the power attenuation degrees of the lasers with different wavelengths are different when the lasers with different wavelengths pass through a non-laser gain unit, the thickness of the laser gain unit is too small, the laser power amplification is insufficient, the thickness of the laser gain unit is too large, and the power attenuation of the lasers with non-corresponding wavelengths is too large. In order to meet the effective gain amplification of laser powers with different wavelengths and effectively control the attenuation influence of the laser powers with different wavelengths, through comprehensive calculation, all laser gain units have the same width dimension and the same height dimension perpendicular to the length direction of the base B, and the range is 3 cm-4 cm wide, 1 cm-2 cm high and 1.5 cm-3.5 cm long along the length direction of the base B. Each laser gain unit can transmit laser with the wavelength range of 280nm-2 mu m, but each laser gain unit only carries out gain amplification on the laser with the specified wavelength range, and does not generate gain amplification, frequency conversion, wavelength conversion or waveform conversion except for having certain power loss on the laser with non-corresponding gain wavelength. The laser gain unit can be a gain crystal block or a transparent closed pool filled with gain medium. The gain medium may be a coumarin series dye.
In one implementation manner, the second mounting groove provided by the invention comprises 10 clamping grooves B, so that 1-10 laser gain units can be fixed.
The second mounting groove and the base B can be fixedly connected or slidably connected, and when the second mounting groove and the base B are slidably connected, the laser gain units with different lengths can be mounted, so that different laser gain requirements can be met.
In the first embodiment, the second installation groove is formed by a baffle B and more than one baffle B positioned between two baffles B, wherein the baffle B is installed at two ends of the base B in the direction perpendicular to the length direction of the base B, a clamping groove B is formed between the adjacent baffle B and the baffle B or between the adjacent two baffles B, and the design of the baffle B and the baffle B satisfies that the air separation layer between the baffle B and the laser gain unit is reduced as much as possible. The baffle B and the baffle B are respectively and fixedly connected with the base B. The heights of the baffle B and the baffle B are the same or different. Further, the heights of the baffle B and the baffle B are not lower than half of the height of the laser gain unit and are not higher than 1.5 times of the height of the laser gain unit.
In the second embodiment, the second installation groove is formed by a baffle B 'installed at two ends of the base B in a direction perpendicular to the length direction of the base B and at least one baffle B' located between the two baffles B ', a clamping groove B is formed between an adjacent baffle B' and the baffle B ', or between two adjacent baffles B', the baffles B 'are fixedly or slidingly connected with the base B, and the baffles B' are slidingly connected with the base B. The heights of the baffle B 'and the baffle B' higher than the base B are the same or different. Further, the heights of the baffle B 'and the baffle B' are not lower than half of the height of the laser gain unit and are not higher than 1.5 times of the height of the laser gain unit.
Furthermore, the two sides of the base B are provided with L-shaped sliding grooves B, scales are marked on a cantilever B above the L-shaped sliding grooves B, the whole partition board B 'is in an L shape and is slidably arranged in the L-shaped sliding grooves B, the partition board B' comprises a horizontal part B and a vertical part B, the vertical part B is provided with a notch B which is matched with the cantilever B in height, the height of the horizontal part B is matched with the height of the horizontal notch B of the L-shaped sliding grooves B, and the horizontal part B extends out from the horizontal notch B and is locked by adjusting a handle B. The partition board B ' and the L-shaped chute B form a sliding pair, the partition board B ' can be rapidly positioned through scales marked on the cantilever B, and rapid locking between the partition board B ' and the L-shaped chute B can be achieved through adjusting the handle B. And the detachable connection mode formed by the base B and the partition board B' and the adjusting handle B ensures that the multi-wavelength laser gain amplifying device has the portable advantage, and the application range of the multi-wavelength laser frequency doubling device and the multi-wavelength space laser modulation device can be further expanded.
In one implementation manner, the first multi-wavelength laser filter is used for locking the central wavelength lasers output by all the laser frequency doubling units and filtering out other stray lasers except the central wavelengths, and the second multi-wavelength laser filter is used for locking the central wavelength lasers output by all the laser gain units and filtering out other stray lasers except the central wavelengths.
It should be noted that:
(1) The laser is always perpendicular to the longitudinal sections of the laser frequency doubling unit and the laser gain unit for incidence;
(2) In the whole light path, the output laser energy of the previous device is smaller than the laser energy threshold value which can be born by the next device;
(3) Reference to single wavelength or multiple wavelengths refers to the center wavelength of the laser.
Compared with the prior art, the invention has the following beneficial effects:
(1) The multi-wavelength laser frequency doubling device provided by the invention can simultaneously realize frequency doubling of multiple wavelength lasers, and provides a new thought for greatly simplifying the laser path structure, reducing the cost and integrating an optical system while realizing effective frequency doubling of the lasers;
(2) The multi-wavelength laser frequency doubling device provided by the invention is of a detachable structure, can adjust the selection of the laser frequency doubling unit according to the requirement, can be suitable for different application fields, has wide applicability, can further design a first mounting groove and a base for fixing the laser frequency doubling unit as sliding pairs, meets the requirements of the laser frequency doubling units with different sizes, and expands the application field of the multi-wavelength laser frequency doubling device;
(3) The multi-wavelength space laser modulation device provided by the invention can simultaneously realize the composite functions of multi-wavelength laser selective frequency up-conversion, multi-wavelength laser waveform modulation and shaping, multi-wavelength laser power amplification and multi-wavelength laser filtering, provides a new thought for realizing multi-wavelength laser efficient modulation, has relatively low price of components adopted by the structure, and has fewer components compared with the traditional laser modulation device, and the cost can be effectively saved;
(4) The multi-wavelength space laser modulation device solves the problem that the peak power of output laser is limited due to the fact that the waveform of the traditional pulse laser is deformed and deviates farther from Gaussian by a multi-wavelength laser shaping assembly;
(5) The multi-wavelength space laser modulation device provided by the invention can realize the simultaneous operation of various laser gain media, and provides a new idea for simultaneous amplification of multi-wavelength lasers;
(6) The multi-wavelength space laser modulation device provided by the invention has the advantages of simple structure and convenience in construction, and can increase or decrease the number of the laser frequency doubling units and the laser shaping amplifying mechanisms according to the needs, and has strong expansibility and flexibility.
Drawings
FIG. 1 is a schematic diagram of a multi-wavelength frequency doubling device according to embodiment 1 of the present invention;
FIG. 2 is a side view of a multi-wavelength laser frequency doubling device according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of a multi-wavelength frequency doubling device according to embodiment 2 of the present invention;
FIG. 4 is a schematic cross-sectional view of the multi-wavelength frequency doubling device of embodiment 2 perpendicular to the length direction of the base A;
FIG. 5 is a top view showing the assembled base A, baffle A ', and baffle A' of example 2 of the present invention;
FIG. 6 is a schematic cross-sectional view of the base A perpendicular to the length direction in embodiment 2 of the present invention;
FIG. 7 is a schematic view showing the structure of a separator A' in embodiment 2 of the present invention;
FIG. 8 is a schematic structural diagram of a multi-wavelength spatial laser modulation device according to embodiment 3 of the present invention;
FIG. 9 is a schematic diagram of a gain amplifying structure of a multi-wavelength laser according to embodiment 3 of the present invention;
FIG. 10 is a schematic diagram of a multi-wavelength laser gain amplifying device according to embodiment 3 of the present invention;
FIG. 11 is a schematic structural diagram of a multi-wavelength spatial laser modulation device according to embodiment 4 of the present invention;
FIG. 12 is a schematic diagram of a multi-wavelength laser gain amplifier device according to embodiment 4 of the present invention;
FIG. 13 is a schematic cross-sectional view of a multi-wavelength laser gain amplifier device according to embodiment 4 of the present invention perpendicular to the longitudinal direction of the base B;
FIG. 14 is a top view showing the assembled base B, baffle B ', and baffle B' of example 4 of the present invention;
FIG. 15 is a schematic cross-sectional view of the base B perpendicular to the length direction in embodiment 4 of the present invention;
FIG. 16 is a schematic view showing the structure of a separator B' in embodiment 4 of the present invention;
In the figure, an I-fundamental frequency laser, an II-selective frequency doubling mechanism, a III-multi-wavelength laser shaping component, an IV-multi-wavelength laser gain amplifying component;
1-multi-wavelength laser frequency doubling device, 2-optical beam splitter, 3-optical coupler A, 4-first multi-wavelength laser filter, 5-three-port unidirectional transmitter, 6-multi-wavelength laser waveform shaper, 7-total reflector, 8-multi-wavelength laser gain amplifying structure, 9-second multi-wavelength laser filter, K1-first optical switch, K2-second optical switch;
11-base A, 111-L-shaped chute A, 112-cantilever A, 113-horizontal notch A, 12-laser frequency doubling unit, 13-first mounting groove, 131-baffle A, 132-baffle A, 133-baffle A ', 134-baffle A', 1341-horizontal part a, 1342-vertical part a, 1343-notch a, 14-adjusting handle A;
81-multi-wavelength laser gain amplifying device, 811-base B, 8111-L-shaped chute B, 8112-cantilever B, 8113-horizontal notch B, 812-laser gain unit, 813-second mounting groove, 8131-baffle B, 8132-baffle B, 8133-baffle B ', 8134-baffle B', 81341-horizontal portion B, 81342-vertical portion B, 81343-notch B, 814-adjusting handle B, 82-pump source, 83-optical coupler B, 84-optical collimator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Example 1
The present embodiment provides a multi-wavelength laser frequency doubling device, as shown in fig. 1 and 2, which includes a base a11 and more than one laser frequency doubling unit 12 (3 laser frequency doubling units 12 are shown in the present embodiment).
Each laser frequency doubling unit 12 corresponds to a laser with a wavelength, is used for carrying out frequency doubling treatment on the laser with the corresponding wavelength, and can transmit the laser with the wavelength ranging from 280nm to 2 mu m. For example, the laser frequency doubling unit 12 may be a block of frequency doubling crystals or a transparent closed cell filled with frequency doubling media. The doubling medium may be coumarin series dye. All laser frequency doubling units have the same size. In this embodiment, the length, width and height directions of the base a11 are used as directional references, and the length, width and height of the laser frequency doubling unit 12 are 2cm, 4cm and 2cm.
As shown in fig. 1 and 2, two rows of first mounting grooves 13 are arranged on two sides of a base a11 and are parallel to each other along the length direction of the base a11, each row of first mounting grooves 13 comprises 10 coaxially arranged clamping grooves a, the clamping grooves a on the two rows of first mounting grooves 13 are symmetrically arranged, and the laser frequency doubling units 12 are arranged in the clamping grooves a symmetrically arranged in the two rows of first mounting grooves 13. Specifically, the first mounting groove 13 is constituted by a baffle a131 mounted on both ends of the base a11 in the longitudinal direction of the base a11 and 9 separators a132 located between the two baffles a 131. The baffle A131 and the baffle A132 are respectively and fixedly connected with the base A11. In order to achieve effective support of the laser frequency doubling unit 12, the width of the base a11 is 4cm and the height is 2cm, and the length is determined by the length of the baffle a131, the baffle a132 and the laser frequency doubling unit 12.
The adjacent baffle A131 and the baffle A132 or the adjacent two baffles A132 form a clamping groove A, and the clamping groove A is designed to reduce the air interlayer as far as possible between the laser frequency doubling unit 12 and the adjacent baffle A131. In this embodiment, the heights of the baffle A131 and the baffle A132 are the same as the height of the laser frequency doubling unit 12, and are 2cm, the length of the baffle A131 is 1cm, the width of the baffle A131 is 1cm, and the length of the baffle A132 is 0.3cm, and the width of the baffle A132 is 1cm.
Example 2
The present embodiment provides a multi-wavelength laser frequency doubling device, as shown in fig. 3 and 4, which includes a base a11 and more than one laser frequency doubling unit 12 (3 laser frequency doubling units 12 are shown in the present embodiment).
Each laser frequency doubling unit 12 corresponds to a laser with a wavelength, is used for carrying out frequency doubling treatment on the laser with the corresponding wavelength, and can transmit the laser with the wavelength ranging from 280nm to 2 mu m. For example, the laser frequency doubling unit 12 may be a block of frequency doubling crystals or a transparent closed cell filled with frequency doubling media. The doubling medium may be coumarin series dye. All laser doubling elements 12 are the same size. In this embodiment, the length, width and height directions of the base a11 are used as directional references, and the length, width and height of the laser frequency doubling unit 12 are 2cm, 4cm and 2cm.
As shown in fig. 3 and 4, two rows of first mounting grooves 13 are arranged on two sides of the base a11 and are parallel to each other along the length direction of the base a11, each row of first mounting grooves 13 comprises 10 coaxially arranged clamping grooves a, the clamping grooves a on the two rows of first mounting grooves 13 are symmetrically arranged, and the laser frequency doubling units 12 are arranged in the clamping grooves a symmetrically arranged in the two rows of first mounting grooves 13. Specifically, the first installation groove 13 is formed by a baffle a '133 installed at both ends of the base a11 in a direction perpendicular to the length direction of the base a11 and 9 partitions a '134 located between the two baffles a ' 133. In order to achieve effective support of the laser frequency doubling unit 12, the base a11 has a width of 4cm and a height of 2cm, and the length is determined by the length of the baffle a '133, the baffle a'134 and the laser frequency doubling unit 12.
A clamping groove A is formed between the adjacent baffle A '133 and the baffle A'134 or between the adjacent two baffles A '134, and the clamping groove A is designed to reduce the air interlayer between the adjacent baffle A'133 and the laser frequency doubling unit 12 as much as possible.
In this embodiment, the baffle a'133 is fixedly connected to the base a 11. The height of the baffle A '133 is 2cm as that of the laser frequency doubling unit 12, and the length and width of the baffle A'133 are 1cm and 1cm respectively.
In this embodiment, the partition A'134 is slidably connected to the base A11. As shown in fig. 3-7, both sides of the base A11 are provided with L-shaped sliding grooves A111, and as shown in fig. 6, the L-shaped sliding grooves A111 comprise horizontal notch A113 arranged along the horizontal direction and vertical notch A arranged along the vertical direction, the height of the horizontal notch A113 is 0.7cm, and the width of the vertical notch A is 0.5cm. Cantilever A112 above L-chute A111 was 0.5cm wide and 0.6cm high, with graduations marked thereon. The partition plate A'134 is L-shaped and slidably mounted in the L-shaped chute A111. The partition plate A'134 comprises a horizontal part a1341 and a vertical part a1342, wherein the width of the horizontal part a1341 is 1.8cm, the height of the horizontal part a1341 is 0.6cm, the width of the vertical part a1342 is 1cm, the height of the vertical part a1342 is 2.7cm, the lengths of the horizontal part a1341 and the vertical part a1342 are 3mm, a notch a1343 which is matched with the height of the cantilever A112 is formed in the vertical part a1342, the width of the notch a1343 is 0.5cm, the height of the notch a1343 is 0.7cm, the height of the horizontal part a1341 is matched with the height of a horizontal notch A113 of the L-shaped chute A111, the horizontal part a1341 extends from the horizontal notch A113, the extending part is locked by an adjusting handle A14 and a screw, and a threaded hole which is matched with the screw is formed in the adjusting handle A14. During installation, the partition plate A '134 can be buckled on the cantilever A112 through the L-shaped chute A111, the horizontal part a1341 of the partition plate A'134 is placed in a gap along the long side of the L-shaped chute A111, then the partition plate A '134 can be placed on the cantilever A112 by rotating the partition plate A' by 90 degrees, the horizontal part a1341 of the partition plate A '134 can slide on the cantilever A112, after a proper position is selected according to scales, the adjusting handle A14 and the horizontal part a1341 are buckled together through screws, and the partition plate A'134 can be fixed at the corresponding position of the cantilever A112.
Through the design of the sliding connection structure between the partition plate A '134 and the base A11, not only can the effective fixation of the laser frequency doubling unit 12 be realized, but also the air interlayer between the partition plate A'134 and the laser frequency doubling unit 12 can be reduced as much as possible, and the fixation requirements of the laser frequency doubling units 12 with different sizes can be realized.
Example 3
The embodiment provides a multi-wavelength space laser modulation device, which comprises a fundamental frequency laser I, a selective frequency doubling mechanism II and a group of laser shaping and amplifying mechanisms, wherein the laser shaping and amplifying mechanisms comprise a multi-wavelength laser shaping component III and a multi-wavelength laser gain amplifying component IV, as shown in fig. 8. The fundamental frequency laser I outputs fundamental frequency laser, the fundamental frequency laser is subjected to selective frequency conversion through a selective frequency doubling mechanism II, is subjected to twice waveform shaping through a multi-wavelength laser shaping assembly III, and then is subjected to gain amplification through a multi-wavelength laser gain amplification assembly IV.
The fundamental laser I is used to provide laser light at more than one wavelength. The laser wavelength range of the output of the fundamental frequency laser is 280nm-2 mu m. The fundamental frequency laser I may be a single laser or a plurality of lasers. The laser output by the fundamental frequency laser is single-wavelength or multi-wavelength laser.
The selective frequency doubling mechanism II is used for carrying out selective frequency conversion on the laser output laser of the fundamental frequency laser. The selective frequency doubling mechanism II comprises an optical beam splitter 2, a frequency doubling optical path and a non-frequency doubling optical path which are positioned at the back two output directions of the optical beam splitter 2, and an optical coupler A3 for coupling laser generated by the frequency doubling optical path and the non-frequency doubling optical path. The frequency multiplication light path comprises a first optical switch K1, a multi-wavelength laser frequency multiplication device 1 and a first multi-wavelength laser filter 4 which are sequentially arranged. The non-frequency multiplication optical path is provided with a second optical switch K2.
The multi-wavelength laser frequency doubling device 1 uses the multi-wavelength laser frequency doubling device provided in example 2.
The 50:50 optical beam splitter is used as the optical beam splitter 2.
The first optical switch K1 and the second optical switch K2 are selectively switched on or off, so that the selective frequency doubling mechanism II has three switch communication modes:
(1) The selective frequency doubling mechanism II is coupled and output to form a laser beam containing multi-wavelength target wavelength laser by the fundamental frequency laser output by the fundamental frequency laser I and the frequency doubling laser converted by the multi-wavelength laser frequency doubling device 1;
(2) Only the first optical switch K1 in the frequency multiplication optical path is started, and at the moment, the selective frequency multiplication mechanism II is coupled and output as frequency multiplication laser converted by the multi-wavelength laser frequency multiplication device 1;
(3) And at the moment, the selective frequency doubling mechanism II is coupled to output fundamental frequency laser output by the fundamental frequency laser I.
The first multi-wavelength laser filter 4 is used for filtering the laser beam subjected to frequency multiplication by the multi-wavelength laser frequency multiplier 1 to obtain laser containing target wavelength.
The fundamental frequency laser from the fundamental frequency laser I is directly transmitted to the optical coupler A3 through the non-frequency multiplication optical path, and is coupled with the frequency multiplication laser processed by the first multi-wavelength laser filter 4 through the optical coupler A3 to obtain a laser beam containing the laser with the target wavelength.
In order to adjust the laser direction in the frequency doubling optical path after passing through the optical beam splitter 2, the present embodiment is further provided with a first total reflection mirror and a second total reflection mirror in the frequency doubling optical path. The first total reflection mirror is arranged in one emergent direction of the optical beam splitter, and the multi-wavelength laser frequency doubling device 1 and the first multi-wavelength laser filter 4 are positioned in the reflecting direction of the first total reflection mirror. The second total reflection mirror is positioned in the emergent direction of the first multi-wavelength laser filter 4, and the laser reflected by the second total reflection mirror enters the optical coupler A3.
The multi-wavelength laser shaping component III is used for Gaussian shaping of laser output by the selective frequency doubling mechanism II. The multi-wavelength laser shaping assembly III comprises a three-port unidirectional transmitter 5, a multi-wavelength laser waveform shaper 6 and a total reflector 7. The laser output from the selective frequency doubling mechanism II enters a multi-wavelength laser waveform shaper 6 through a three-port unidirectional transmitter 5, the target wavelength laser is shaped through the multi-wavelength laser waveform shaper 6, the shaped laser is reflected by a total reflector 7 and then is shaped for the second time through the multi-wavelength laser waveform shaper 6, and the laser after the second shaping is input into a multi-wavelength laser gain amplifying component IV through the three-port unidirectional transmitter 5.
The three-port unidirectional transmitter 5 is a polarization beam splitter prism PBS or a beam splitter, and the applicable wavelength range is 280nm-2 mu m. The three-port unidirectional transmitter 5 comprises ① ports, ② ports and ③ ports, wherein the ① ports are used as laser input ends of the multi-wavelength laser shaping assembly, the ② ports are in butt joint with one end of the multi-wavelength laser waveform shaper 6, and the ③ ports are used as laser output ends of the multi-wavelength laser shaping assembly.
In this embodiment, the multi-wavelength laser waveform shaper 6 performs Gaussian shaping on laser light having a wavelength in the range of 280nm to 2. Mu.m. The multi-wavelength laser waveform shaper 6 uses a laser pulse clipping shaper. The total reflector 7 uses a total reflection mirror, and the applicable wavelength range is 280nm-2 μm, and the reflection efficiency is 99.9%.
The multi-wavelength laser gain amplifying component IV is used for compensating and amplifying the laser power or energy output by the multi-wavelength laser shaping component III. The multi-wavelength laser gain amplifying assembly IV comprises a multi-wavelength laser gain amplifying structure 8 and a second multi-wavelength laser filter 9.
The multi-wavelength laser gain amplifying structure 8 is used for gain amplifying the target wavelength laser. As shown in fig. 9, the multi-wavelength laser gain amplifying structure 8 includes a multi-wavelength laser gain amplifying device 81, pump sources 82 adapted to a target wavelength, the same number of optical couplers B83 as the pump sources 82, and an optical collimator 84. The laser emitted by each pump source 82 enters the multi-wavelength laser gain amplifying device 81 together with the laser incident on the multi-wavelength laser gain amplifying structure 8 to be amplified by the corresponding optical coupler B83, and then outputs a laser beam containing the laser with the target wavelength by the optical collimator 84.
As shown in fig. 10, the multi-wavelength laser gain amplification device 81 includes a base B811 and one or more laser gain cells 812 (2 laser gain cells 812 are shown in this embodiment).
Each laser gain unit 812 performs gain amplification on laser light in a specified wavelength range, and can transmit laser light in a wavelength range of 280nm to 2 μm. For example, the laser gain cell 812 may be a gain crystal block or a transparent closed cell filled with a gain medium. The gain medium may be a coumarin series dye. The dimensions of all laser gain cells are the same. In this embodiment, the length, width and height directions of the base B811 are used as directional references, and the length of the laser gain unit 812 is 3cm, the width is 4cm, and the height is 2cm.
Two rows of second mounting grooves 813 parallel to the length direction of the base B811 are formed in two sides of the base B811, each row of second mounting grooves 813 comprises 10 clamping grooves B which are coaxially arranged, the clamping grooves B on the two rows of second mounting grooves 813 are symmetrically arranged, and the laser gain units 812 are arranged in the clamping grooves B which are symmetrically arranged in the two rows of second mounting grooves 813. Specifically, the second mounting groove 813 is formed by baffle plates B8131 mounted on both ends of the base plate B811 in the longitudinal direction of the base plate B811, and 9 partition plates B8132 located between the two baffle plates B8131. The baffle B8131 and the baffle B8132 are fixedly connected with the base B811. In order to achieve effective support of the laser gain unit 812, the base B811 has a width of 4cm and a height of 2cm, and the length is determined by the length of the baffle B8131, the baffle B8132, and the laser gain unit 812.
A clamping groove B is formed between the adjacent baffle plate B8131 and the baffle plate B8132 or between the adjacent baffle plates B8132, and the size design of the clamping groove B meets the requirement that the air interlayer is reduced as much as possible between the clamping groove B and the laser gain unit 812. In this embodiment, the heights of the baffle plate B8131 and the baffle plate B8132 are the same as the height of the laser gain unit 812, and are 2cm, the length of the baffle plate B8131 is 1cm, the width of the baffle plate B8132 is 1cm, and the length of the baffle plate B8132 is 0.3cm, and the width of the baffle plate B8132 is 1cm.
In this embodiment, there is no limitation in selecting the pump source 82, and a pump source with a target wavelength within a corresponding operating band may be selected, and for more than two target wavelength lasers with a wavelength interval absolute value smaller than 20nm, one pump source may be used. Fig. 9 shows an example in which the multi-wavelength laser gain amplifying structure 8 is provided with two pump sources 82, and the two pump sources 82 are provided with two optical couplers B83. The laser beams emitted by the two pump sources 82 enter the multi-wavelength laser gain amplifying device 81 together with the laser beams incident on the multi-wavelength laser gain amplifying structure 8 for power amplification after passing through the corresponding optical coupler B83, and then the laser beams containing the laser beams with the target wavelengths are output through the optical collimator 84.
The second multi-wavelength laser filter 9 is used for filtering the laser beam output by the multi-wavelength laser gain amplifying structure 8 to obtain final target wavelength laser.
Example 4
This example is a further improvement over example 3.
The multi-wavelength space laser modulation device provided in this embodiment, as shown in fig. 11, includes a fundamental frequency laser I, a selective frequency doubling mechanism II, and three sets of laser shaping and amplifying mechanisms. The three groups of laser shaping and amplifying mechanisms have the same structure and comprise a multi-wavelength laser shaping component III and a multi-wavelength laser gain amplifying component IV. The fundamental frequency laser I outputs fundamental frequency laser, which is subjected to selective frequency conversion by the selective frequency doubling mechanism II, and then is subjected to waveform shaping and power amplification by the three groups of laser shaping and amplifying mechanisms in sequence, and the output of the former group of laser shaping and amplifying mechanisms is used as the input of the latter group of laser shaping and amplifying mechanisms.
The structure of the fundamental frequency laser I, the selective frequency doubling mechanism II, and the multi-wavelength laser shaping component III is the same as in embodiment 3.
In the present embodiment, as shown in fig. 11, the multi-wavelength laser gain amplifying assembly IV includes a multi-wavelength laser gain amplifying structure 8 and a second multi-wavelength laser filter 9. As shown in fig. 9, the multi-wavelength laser gain amplifying structure 8 includes a multi-wavelength laser gain amplifying device 81, pump sources 82 adapted to a target wavelength, the same number of optical couplers B83 as the pump sources 82, and an optical collimator 84. The laser emitted by each pump source 82 enters the multi-wavelength laser gain amplifying device 81 together with the laser incident on the multi-wavelength laser gain amplifying structure 8 to be amplified by power after passing through the corresponding optical coupler B83, and then outputs a laser beam containing the laser with the target wavelength through the optical collimator 84.
As shown in fig. 12 to 13, the multi-wavelength laser gain amplifying device 81 includes a base B811 and one or more laser gain units 812 (2 laser gain units 812 are shown in the present embodiment).
Each laser gain unit 812 performs gain amplification on laser light in a specified wavelength range, and can transmit laser light in a wavelength range of 280nm to 2 μm. For example, the laser gain cell 812 may be a gain crystal block or a transparent closed cell filled with a gain medium. The gain medium may be a coumarin series dye. The dimensions of all laser gain cells are the same. In this embodiment, the length, width and height directions of the base B811 are used as directional references, and the length of the laser gain unit 812 is 3cm, the width is 4cm, and the height is 2cm.
As shown in fig. 12-13, two rows of second mounting grooves 813 parallel to the length direction of the base B811 are formed on two sides of the base B811, each row of second mounting grooves 813 includes 10 coaxially arranged grooves B, the grooves B on the two rows of second mounting grooves 813 are symmetrically arranged, and the laser gain unit 812 is mounted in the grooves B symmetrically arranged in the two rows of second mounting grooves 813. Specifically, the second mounting groove 813 is formed by a baffle B '8133 mounted on both ends of the base B811 in the longitudinal direction of the base B811, and 9 spacers B '8134 positioned between the two baffles B ' 8133. In order to achieve effective support of the laser gain unit 812, the base B811 has a width of 4cm and a height of 2cm, and the length is determined by the length of the baffle B '8133, the baffle B'8134, and the laser gain unit 812.
A clamping groove B is formed between the adjacent baffle B '8133 and the baffle B'8134 or between the adjacent two baffles B '8134, and the clamping groove B is dimensioned to reduce the air barrier between the adjacent baffle B'8133 and the laser gain unit 812 as much as possible.
In this embodiment, the baffle B'8133 is fixedly connected to the base B811. The height of the baffle B '8133 is 2cm as that of the laser gain unit 812, and the length and width of the baffle B'8133 are 1cm and 1cm respectively.
In this embodiment, the partition B'8134 is slidably connected to the base B811. As shown in fig. 12-16, both sides of the base B811 are provided with L-shaped sliding grooves B8111, and as shown in fig. 15, the L-shaped sliding grooves B8111 comprise horizontal notch B8113 arranged in the horizontal direction and vertical notch B arranged in the vertical direction, the height of the horizontal notch B8113 is 0.7cm, and the width of the vertical notch B is 0.5cm. The cantilever B8112 above the L-shaped chute B8111 is 0.5cm wide and 0.6cm high, and scales are marked on the cantilever B8112. The partition board B'8134 is L-shaped and is slidably installed in the L-shaped chute B8111. The partition board B'8134 comprises a horizontal part B81341 and a vertical part B81342, the width of the horizontal part B81341 is 1.8cm, the height of the horizontal part B81341 is 0.6cm, the width of the vertical part B81342 is 1cm, the height of the vertical part B81342 is 2.7cm, the lengths of the horizontal part B81341 and the vertical part B81342 are 3mm, a notch B81343 which is matched with the height of the cantilever B8112 is formed in the vertical part B81342, the width of the notch B81343 is 0.5cm, the height of the notch B81343 is 0.7cm, the height of the horizontal part B81341 is matched with the height of a horizontal notch B8113 of the L-shaped chute B8111, the horizontal part B81341 extends from the horizontal notch B8113, the extending part is locked by an adjusting handle B814 and a screw, and a threaded hole which is matched with the screw is formed in the adjusting handle B814. During installation, the partition board B '8134 can be buckled on the cantilever B8112 through the L-shaped chute B8111, the horizontal part B81341 of the partition board B'8134 is placed in a gap along the long side of the L-shaped chute B8111, then the partition board can be placed on the cantilever B8112 by rotating the partition board by 90 degrees, the horizontal part B81341 of the partition board B '8134 can slide on the cantilever B8112, after a proper position is selected according to the scale, the adjusting handle B814 and the horizontal part B81341 are buckled together through screws, and the partition board B'8134 can be fixed at the corresponding position of the cantilever B8112.
Through the design of the sliding connection structure between the partition board B '8134 and the base B811, not only can the effective fixation of the laser gain unit 812 be realized, but also the air interlayer between the partition board B'8134 and the laser gain unit 812 can be reduced as much as possible, and the fixation requirements of the laser gain units 812 with different sizes can be realized.
In this embodiment, the selection of the pump source is not limited, and a pump source with a target wavelength within a corresponding operating band may be selected, and for two or more target wavelength lasers with a wavelength interval absolute value smaller than 20nm, one pump source may be used.
The second multi-wavelength laser filter 9 is used for filtering the laser beam output by the multi-wavelength laser gain amplifying structure 8 to obtain final target wavelength laser.
In order to optimize the spatial configuration of the multi-wavelength spatial laser modulation device, the embodiment is further provided with a third total reflection mirror for adjusting the laser direction in the laser emitting direction of the second group of laser shaping and amplifying mechanisms, and the laser beam reflected by the third reflection mirror enters the third group of laser shaping and amplifying mechanisms to carry out waveform shaping and power amplification.
Application example 1
The application example is based on the multi-wavelength spatial laser modulation device provided in embodiment 4 to realize modulation output of six target wavelengths.
In a specific implementation manner, the fundamental frequency laser I is a potassium-rubidium-cesium (K-Rb-Cs) three-wavelength alkali metal vapor laser, and in operation, the fundamental frequency laser I outputs 770nm (K laser), 795nm (Rb laser) and 895nm (Cs laser) mixed three-wavelength laser. Three BBO crystal blocks aiming at 770nm, 795nm and 895nm are inserted in the first mounting groove 13 in advance, and when the three BBO crystal blocks are arranged in the first mounting groove 13, different crystal directions are formed relative to the incident light direction so as to meet the frequency doubling of laser with the three wavelengths. The first multi-wavelength laser filter 4 is used to lock out 385nm, 398nm, 448nm three-wavelength lasers. The three-port unidirectional transmitter 5 is a PBS (polarization splitting prism). The multi-wavelength laser waveform shaper 6 uses a laser pulse clipping shaper. In the multi-wavelength laser gain amplifying device 81, there are two laser gain units, which are respectively a titanium sapphire crystal and a transparent closed cell filled with coumarin, and are used for gain amplification of six wavelengths of 770nm, 795nm, 895nm, 385nm, 398nm and 448nm, and because the absolute value of the distance between 385nm and 398nm is smaller than 20nm, the same pump source can be used, the multi-wavelength laser gain amplifying structure 8 is provided with 5 pump sources 82 and 5 optical couplers B83 which are adapted to each target wavelength. The second multi-wavelength laser filter 9 is used for locking laser light of six wavelengths of 770nm, 795nm, 895nm, 385nm, 398nm and 448 nm.
When the first optical switch K1 and the second optical switch K2 are simultaneously started, half of the three-wavelength laser beams are 770nm, 795nm and 895nm after passing through the second optical switch K2, the other half of the three-wavelength laser beams are subjected to frequency multiplication through the multi-wavelength laser frequency doubling device 1 after passing through the first optical switch K1 to obtain 385nm, 398nm and 448nm three-wavelength laser beams, then the 385nm, 398nm and 448nm three-wavelength laser beams are locked after passing through the first multi-wavelength laser filter 4, other stray light is filtered and then output, and the optical coupler A3 transmits 770nm, 795nm and 895nm three-wavelength laser beams and simultaneously reflects 385nm, 398nm and 448nm three-wavelength laser beams. Therefore, the two paths of light are simultaneously coupled by the optical coupler A3 to obtain six-wavelength alkali metal laser outputs with the wavelengths of 770nm, 795nm, 895nm, 385nm, 398nm and 448 nm. The six-wavelength laser enters from ① port of three-port unidirectional transmitter 5 and is output from ② port of three-port unidirectional transmitter 5, multi-wavelength laser wave shaper 6 and total reflector 7 are two devices capable of processing the six-wavelength laser, multi-wavelength laser wave shaper 6 has laser transmission channel for the six-wavelength laser, gaussian shaping of wave form can be implemented on the six-wavelength laser, the six-wavelength laser after wave shaping is reflected by total reflector 7 by 99.9%, and then reversely enters into multi-wavelength laser wave shaper 6 again to implement secondary wave shaping, at this time, the polarization characteristic of the six-wavelength laser has changed pi/2, so that the six-wavelength laser is output from multi-wavelength laser wave shaper 6 through ③ port of three-port unidirectional transmitter 5, and power compensation and amplification are implemented through multi-wavelength laser gain amplifying structure 8.
The amplified laser is filtered by a second multi-wavelength laser filter 9 to lock the lasers with the central wavelengths of 770nm, 795nm, 895nm, 385nm, 398nm and 448nm respectively.
According to the mode, six-wavelength laser is subjected to waveform shaping and power amplification by the second group of laser shaping and amplifying mechanisms and is subjected to waveform shaping and power amplification by the third group of laser shaping and amplifying mechanisms, and then six-wavelength laser output of 770nm, 795nm, 895nm, 385nm, 398nm and 448nm, which are subjected to total six times of waveform shaping and three times of energy/power amplification, is obtained, and the deviation between the central wavelength and the target wavelength is not more than 2nm.
Application example 2
The application example is based on the multi-wavelength space laser modulation device provided in embodiment 4 to realize dual-wavelength modulation output.
In a specific implementation manner, the fundamental frequency laser I is an Nd-YAG solid laser, and when in operation, the fundamental frequency laser I outputs 1064nm single-wavelength laser. A block of frequency doubling KTP crystals for a wavelength of 1064nm is inserted in advance into the first mounting groove 13. The first multi-wavelength laser filter 4 is used to lock 532nm wavelength laser light. The three-port unidirectional transmitter 5 is a PBS (polarization splitting prism). The multi-wavelength laser waveform shaper 6 uses a laser pulse clipping shaper. In the multi-wavelength laser gain amplifying device 81, there are two kinds of laser gain units (Nd: YAG crystal and transparent closed dye pool filled with coumarin) for gain amplifying laser beams with 1064nm and 532nm wavelengths, respectively, and the multi-wavelength laser gain amplifying structure 8 is provided with 2 pump sources 82 and 2 optical couplers B83 adapted to each target wavelength. A second multi-wavelength laser filter 9 is used to lock out 1064nm, 532nm wavelength lasers.
When the first optical switch K1 and the second optical switch K2 are simultaneously turned on, half of the 1064nm laser beam is still 1064nm laser after passing through the second optical switch K2, the other half of the 1064nm laser beam is subjected to frequency multiplication through the first optical switch K1 to obtain 532nm wavelength laser, the 532nm wavelength laser is locked through the first multi-wavelength laser filter 4 and other stray light is filtered and output, 532nm band frequency multiplication laser is obtained, and the optical coupler A3 transmits 1064nm wavelength laser and simultaneously reflects 532nm wavelength laser. Therefore, after the two paths of light are coupled through the optical coupler A3 at the same time, the dual-wavelength laser output with the wavelengths of 1064nm and 532nm is obtained. The laser with the wavelengths enters from the ① port of the three-port unidirectional transmitter 5 and is output from the ② port of the three-port unidirectional transmitter 5, the multi-wavelength laser wave shaper 6 and the total reflector 7 are two devices capable of processing laser with the wavelengths of 1064nm and 532nm, the multi-wavelength laser wave shaper 5 is provided with transmission channels for the laser with the wavelengths of 1064nm and 532nm, the laser with the wavelengths of 1064nm and 532nm can be subjected to wave Gaussian shaping, the shaped dual-wavelength laser is subjected to 99.9% reflection through the total reflector 7 and reversely enters the multi-wavelength laser wave shaper 6 again to be subjected to secondary wave shaping, at the moment, the polarization characteristics of the laser with the wavelengths of 1064nm and 532nm are changed by pi/2, and therefore the laser with the wavelengths of the two wavelengths is output from the multi-wavelength laser wave shaper 6, is output through the ③ port of the three-port unidirectional transmitter 5, and power compensation and amplification are performed through the multi-wavelength laser gain amplification structure 8.
The amplified laser is filtered by stray light through a second multi-wavelength laser filter 9, and the dual-wavelength laser with the center wavelength of 1064nm and 532nm is locked.
According to the mode, the dual-wavelength laser is subjected to waveform shaping and power amplification by the second group of laser shaping and amplifying mechanisms, and the third group of laser shaping and amplifying mechanisms are subjected to waveform shaping and power amplification, so that 1064nm and 532nm dual-wavelength laser outputs subjected to six times of waveform shaping and three times of energy/power amplification are obtained, and the deviation between the central wavelength and the target wavelength is not more than 2nm.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.