CN111855488A - Nanosecond two-photon laser excitation fluorescence measurement system - Google Patents
Nanosecond two-photon laser excitation fluorescence measurement systemDownload PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
- G01N21/643—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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Abstract
Description
Technical Field
The invention relates to the technical field of plasma diagnosis, in particular to a nanosecond two-photon laser excitation fluorescence measurement system.
Background
When electrons in a substance atom are attracted away from a nucleus and a negatively charged free electron and a positively charged ion coexist, the electrons and the ions have opposite charges but equal numbers, and this state is called a plasma state.
Wherein, when hydrogen gas discharge is adopted, hydrogen plasma can be generated. Research into hydrogen plasma has helped to better understand the physical and chemical properties of the plasma.
At present, the traditional method for measuring the neutral hydrogen is to extend a detector into the plasma, so that the density of the neutral hydrogen can be measured, but the neutral hydrogen can interfere with the plasma, interference-free measurement cannot be carried out, and the time resolution of the traditional method is low, so that the time high-resolution measurement cannot be realized.
Disclosure of Invention
The invention aims to provide a nanosecond two-photon laser excitation fluorescence measurement system which is used for overcoming the problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a nanosecond two-photon laser excitation fluorescence measurement system comprises a laser unit, a plasma device, a food sucking device, an optical filter, a focusing lens, an optical fiber frame, an optical fiber, an APD detector and an acquisition system,
the laser unit is arranged at the front end of a laser window of the plasma device, the absorber is arranged at the end point of laser, the laser unit comprises Nd, namely a YAG laser, a dye laser, a KDP crystal and a BBO crystal, the Nd, namely the 512nm laser generated by the YAG laser, is used as pump light to enter the dye laser, the dye laser generates 615nm laser, and the 615nm laser sequentially passes through the KDP crystal and the BBO crystal to generate 205nm laser;
the plasma device is provided with a laser window (4) and a signal observation window;
the optical filter is arranged between the focusing lens and the signal observation window;
one end of the optical fiber is fixed on the optical fiber frame, the end face of the optical fiber is arranged on the focal point of the focusing lens, and the other end of the optical fiber is aligned with the APD detector;
and the output voltage of the APD detector is acquired by an acquisition system.
Further, the energy of the laser generated by the Nd: YAG laser is 300mJ-1.5J, and the line width is 1cm-1The energy of the laser generated by the dye laser (13) is 150-300mJ, and the line width is 0.04cm-1The energy of 205nm laser after frequency combination of BBO crystal is 0.5-10mJ, and the line width is 0.07cm-1。
Furthermore, an included angle theta between the e light of the KDP crystal and the optical axis is 71.4 degrees, and an included angle phi between the incident light and the crystal is 90 degrees; the theta angle of the BBO crystal is 71.4 degrees, and phi is 90 degrees.
Furthermore, the optical filter is a band-pass optical filter, the transmitted wave band is 644nm-646nm, and the transmittance is more than 95%.
Further, the transmission wavelength of the laser window comprises 205 nm.
Furthermore, the detector is an APD array detector, and the detection wave band is 300nm-900 nm.
Furthermore, the food suction device is provided with a food suction device base and a food suction device frame, and a multi-surface sawtooth-shaped triangular metal sheet is arranged in the middle of the food suction device base to form a shutter-shaped structure.
The invention has the beneficial effects that:
(1) the invention has the advantages of simple structure, reasonable design and quick installation and maintenance;
(2) according to the technical scheme, the density and the temperature of neutral hydrogen are measured in a mode of measuring fluorescence by exciting the neutral hydrogen in the ground state through laser, and the plasma which is not in direct contact with the neutral hydrogen can be prevented from being interfered;
(3) in the technical scheme of the invention, the pulse width of the laser is only a few nanoseconds, the APD detector can realize the time resolution of a few nanoseconds, the evolution process of the plasma can be better known, and the method has the advantages of high time resolution and accurate measurement.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a schematic diagram of the structure of the laser unit of the present invention;
FIG. 3 is a schematic view of the configuration of the present invention;
in the figure, 1-laser unit; 2-a plasma device; 3-a food sucking device; 4-a laser window; 5-signal observation window; 6-an optical filter; 7-a focusing lens; 8-an optical fiber rack; 9-an optical fiber; 10-APD detectors; 11-an acquisition system; 12-Nd is YAG laser; 13-dye laser; 14-KDP crystals; 15-BBO crystal; 16-triangular metal sheets; 17-a sucker base; 18-sucker frame.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1, fig. 1 is a schematic diagram of the system architecture of the present invention; FIG. 2 is a schematic diagram of the structure of the laser unit of the present invention; fig. 3 is a schematic view of the structure of the food sucking device of the present invention.
Fig. 1 shows a block diagram of an embodiment of the present invention, and it can be seen that a nanosecond two-photon laser excitation fluorescence measurement system comprises a laser unit 1, aplasma device 2, agetter 3, afilter 6, a focusinglens 7, a fiber holder 8, anoptical fiber 9, anAPD detector 10 and anacquisition system 11,
the laser unit 1 is provided with the front end of a laser window 4 of aplasma device 2, theabsorber 3 is provided with a laser terminal point, the laser unit 1 comprises Nd, namely aYAG laser 12, adye laser 13, aKDP crystal 14 and aBBO crystal 15, 512nm laser generated by the Nd, namely theYAG laser 12 enters thedye laser 13 as pump light, thedye laser 13 generates 615nm laser, and the 615nm laser sequentially passes through theKDP crystal 14 and theBBO crystal 15 to generate 205nm laser;
theplasma device 2 is provided with a laser window 4 and asignal observation window 5;
theoptical filter 6 is arranged between the focusinglens 7 and thesignal observation window 5;
one end of theoptical fiber 9 is fixed on the optical fiber frame 8, the end face of theoptical fiber 9 is arranged on the focal point of the focusinglens 7, and the other end of theoptical fiber 9 is aligned with theAPD detector 10;
the output voltage of theAPD detector 10 is collected by acollection system 11.
The energy of the laser generated by the Nd-YAG laser 12 is 300mJ-1.5J, and the line width is 1cm-1The energy of the laser generated by thedye laser 13 is 150-300mJ, and the line width is 0.04cm-1The energy of 205nm laser after 15 frequency combination of BBO crystal is 0.5-10mJ, the line width is 0.07cm-1。
An included angle theta between the e light of the KDPcrystal 14 and an optical axis is 71.4 degrees, and an included angle phi between the incident light and the crystal is 90 degrees; the theta angle of theBBO crystal 15 is 71.4 degrees, and phi is 90 degrees.
Theoptical filter 6 is a band-pass filter, the transmitted wave band is 644nm-646nm, and the transmittance is more than 95%.
The transmission wavelength of the laser window 4 comprises 205 nm.
Thedetector 10 is an APD array detector, and the detection wave band is 300nm-900 nm.
Thefood suction device 3 is provided with a foodsuction device base 17 and a foodsuction device frame 18, and a multi-surface sawtooth-shapedtriangular metal sheet 16 is arranged in the middle to form a shutter-shaped structure.
The working principle is as follows: the ground state neutral hydrogen is at a first energy level and can transition to a third energy level upon absorption of two photons with a wavelength of 205 nm. The hydrogen atoms in the third energy level automatically return to the second energy level and emit 656nm fluorescence. By only measuring the light intensity of the fluorescence and carrying out inversion, the density and temperature data of the neutral hydrogen can be known.
First, 205nm laser light needs to be generated. Therefore, 532nm laser light is generated by using a 532nm Nd:YAG laser 12. This beam of laser light enters thedye laser 13 as a pump light source, and thedye laser 13 generates 615nm laser light. The KDP crystal 14 carries out frequency doubling on 615nm laser, and the output laser is mixed laser of 615nm laser and 307.5nm laser. The laser enters theBBO crystal 15 for frequency combination, and the output laser comprises 205nm laser.
The 205nm laser enters and exits theplasma device 2 through the laser window 4. Theplasma device 2 is used to generate plasma. The laser-excited fluorescence is collected through thesignal observation window 5. Thefilter 6 is used for filtering stray light except 656 nm. Thefeeder 3 is provided with a louver-shaped structure, so that laser can be refracted for multiple times in the feeder, and the feeder is used for absorbing incident laser and preventing the incident laser from being reflected.
The focusinglens 7 is used to collect and image the scattered light onto the end face of theoptical fiber 9, and the collected scattered light is transmitted through the optical fiber and enters theAPD detector 10. TheAPD detector 10 converts the optical signal into an electrical signal, theacquisition system 11 acquires the electrical signal to obtain the signal intensity, and then the density and the temperature of the neutral hydrogen can be obtained through calculation by inversion.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. A nanosecond two-photon laser excitation fluorescence measurement system is characterized by comprising a laser unit (1), a plasma device (2), a sucker (3), an optical filter (6), a focusing lens (7), an optical fiber frame (8), an optical fiber (9), an APD detector (10) and an acquisition system (11),
the laser unit (1) is provided with the front end of a laser window (4) of a plasma device (2), the food sucking device (3) is provided with a laser end point, the laser unit (1) comprises an Nd, a YAG laser (12), a dye laser (13), a KDP crystal (14) and a BBO crystal (15), 512nm laser generated by the Nd, the YAG laser (12) enters the dye laser (13) as pump light, the dye laser (13) generates 615nm laser, and the 615nm laser sequentially passes through the KDP crystal (14) and the BBO crystal (15) to generate 205nm laser;
the plasma device (2) is provided with a laser window (4) and a signal observation window (5);
the optical filter (6) is arranged between the focusing lens (7) and the signal observation window (5);
one end of the optical fiber (9) is fixed on the optical fiber frame (8), the end face of the optical fiber (9) is arranged on the focal point of the focusing lens (7), and the other end of the optical fiber (9) is aligned with the APD detector (10);
the output voltage of the APD detector (10) is acquired by an acquisition system (11).
2. The nanosecond two-photon laser excitation fluorescence measurement system according to claim 1, wherein: the energy of the laser generated by the Nd-YAG laser (12) is 300mJ-1.5J, and the line width is 1cm-1The energy of the laser generated by the dye laser (13) is 150-300mJ, and the line width is 0.04cm-1The energy of 205nm laser after frequency combination of BBO crystal (15) is 0.5-10mJ, the line width is 0.07cm-1。
3. The nanosecond two-photon laser excitation fluorescence measurement system according to claim 1, wherein: an included angle theta between the e light of the KDP crystal (14) and an optical axis is 71.4 degrees, and an included angle phi between incident light and the crystal is 90 degrees; the theta angle of the BBO crystal (15) is 71.4 degrees, and phi is 90 degrees.
4. The nanosecond two-photon laser excitation fluorescence measurement system according to claim 1, wherein: the optical filter (6) is a band-pass filter, the transmitted wave band is 644nm-646nm, and the transmittance is more than 95%.
5. The nanosecond two-photon laser excitation fluorescence measurement system according to claim 1, wherein: the transmission wavelength of the laser window (4) comprises 205 nm.
6. The nanosecond two-photon laser excitation fluorescence measurement system according to claim 1, wherein: the detector (10) is an APD array detector, and the detection wave band is 300nm-900 nm.
7. The nanosecond two-photon laser excitation fluorescence measurement system according to claim 1, wherein: the food suction device (3) is provided with a food suction device base (17) and a food suction device frame (18), and a multi-surface sawtooth-shaped triangular metal sheet (16) is arranged in the middle to form a louver-shaped structure.
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| CN202010834175.8ACN111855488A (en) | 2020-08-19 | 2020-08-19 | Nanosecond two-photon laser excitation fluorescence measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625940A (en)* | 2023-05-15 | 2023-08-22 | 浙江大学 | A semi-confocal lens, two-photon laser-induced fluorescence system and its application |
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