技术领域technical field
本发明涉及太赫兹波差频和中红外激光领域，具体涉及一种在微腔中通过腔相位匹配技术差频产生高效率可调谐太赫兹波的装置及方法。The invention relates to the field of terahertz wave difference frequency and mid-infrared laser, in particular to a device and method for generating high-efficiency tunable terahertz waves in a microcavity by using cavity phase matching technology difference frequency.
背景技术Background technique
太赫兹波(Terahertz-wave,THz波)是指频率在0.1-10THz范围内的电磁波，相应的波长为0.03mm～3mm，位于电磁波谱中微波和红外波之间。其在物理、化学、生命科学和医药科学等基础研究领域，以及宽带通信、医学成像、环境监测、药物检测和安全检查等应用研究领域均有巨大的研究价值和广阔的应用前景。Terahertz wave (Terahertz-wave, THz wave) refers to an electromagnetic wave with a frequency in the range of 0.1-10 THz, corresponding to a wavelength of 0.03 mm to 3 mm, which is located between microwave and infrared waves in the electromagnetic spectrum. It has great research value and broad application prospects in basic research fields such as physics, chemistry, life science and medical science, as well as applied research fields such as broadband communication, medical imaging, environmental monitoring, drug detection and safety inspection.
THz波辐射产生的方法主要有电子学方法和光子学方法。目前，电子学方法的转换效率都很低，而且体积庞大，造价和运行成本都很高，对运行的环境要求高。利用非线性光学差频产生THz波方法凭借其能产生宽范围连续可调谐、相干窄带的THz波等优点，逐渐为科研工作者所青睐。There are mainly electronic methods and photonic methods for generating THz wave radiation. At present, the conversion efficiency of electronic methods is very low, and the volume is large, the cost and operation cost are high, and the requirements for the operating environment are high. The method of using nonlinear optical difference frequency to generate THz waves is gradually favored by scientific researchers because of its advantages of wide-range continuously tunable and coherent narrow-band THz waves.
非线性光学差频技术中一个关键的问题在于如何实现相位匹配。传统的双折射相位匹配存在材料特性限制，且不能应用晶体的最大非线性系数和晶体的通光范围等缺点。准相位匹配也存在周期性反转非线性晶体制作工艺复杂，排列结构较大等缺点。因此一种在制作工艺、结构上更加简单小巧的相位匹配技术逐渐进入人们的视野，即腔相位匹配(CPM)技术。CPM的原理是利用法布里-帕罗微腔对激光的全反射引入额外的π相位来实现相位匹配的，这与准相位匹配利用非线性系数反转来实现π相位的转换非常相似，不同之处在与腔相位匹配只改变了波的传播方向而没有改变晶体的非线性系数。但在目前人们的研究范围内，主要是针对泵浦光正入射到法布里-帕罗微腔中实现光参量震荡放大等一些问题展开讨论。在这些讨论中，泵浦光通常都是单程增益，即使是双程增益，对于泵浦光的利用率也是极其低下，这也是在目前的腔相位匹配中非线性转换效率低下一个非常重要的原因，如果能够提高对泵浦光的利用率，那么腔相位匹配技术将比准相位匹配技术拥有更大的优势。A key problem in nonlinear optical difference frequency technology is how to achieve phase matching. The traditional birefringent phase matching has limitations in material properties, and cannot be applied to the shortcomings of the maximum nonlinear coefficient of the crystal and the light transmission range of the crystal. Quasi-phase matching also has the disadvantages of periodic inversion nonlinear crystal manufacturing process and large arrangement structure. Therefore, a more simple and compact phase matching technology in terms of manufacturing process and structure has gradually entered people's field of vision, that is, cavity phase matching (CPM) technology. The principle of CPM is to use the total reflection of the Fabry-Perot microcavity to introduce an additional π phase to achieve phase matching, which is very similar to quasi-phase matching using nonlinear coefficient inversion to achieve π phase conversion. The advantage is that the phase matching with the cavity only changes the propagation direction of the wave without changing the nonlinear coefficient of the crystal. However, in the scope of current research, it is mainly to discuss some issues such as the normal incidence of pump light into the Fabry-Perot microcavity to achieve optical parametric oscillation amplification. In these discussions, the pump light is usually a one-way gain, even if it is a two-way gain, the utilization rate of the pump light is extremely low, which is also a very important reason for the low nonlinear conversion efficiency in the current cavity phase matching , if the utilization of pump light can be improved, then cavity phase matching technology will have greater advantages than quasi-phase matching technology.
发明内容Contents of the invention
本发明为克服背景技术中存在的问题，提供了一种CO2激光从微腔的边缘进入腔中进行差频，再对整个微腔进行定点旋转引起入射光偏转角度的改变，使得腔相位匹配的周期发生改变来实现可调谐太赫兹波的产生，从而克服准相位匹配以及目前腔相位匹配中的缺点。In order to overcome the problems in the background technology, the present invention provides aCO2 laser entering the cavity from the edge of the microcavity for frequency difference, and then rotating the entire microcavity to cause a change in the deflection angle of the incident light, so that the phase of the cavity is matched The period of the cavity is changed to realize the generation of tunable terahertz waves, thereby overcoming the shortcomings of quasi-phase matching and current cavity phase matching.
本发明采用以下技术方案实现上述目的。一种在微腔中产生可调谐太赫兹波的装置，包括可调谐CO2激光器放电腔，所述可调谐CO2激光器放电腔的左侧并列设置有两个腔外光栅，腔外光栅和可调谐CO2激光器放电腔构成可调谐双波长输出激光器，在可调谐CO2激光器放电腔的右侧设置有全反射镜和布儒斯特窗，且全反射镜和布儒斯特窗分别与腔外光栅对应；在布儒斯特窗的外侧依次设置有微腔和接收窗口，所述微腔的下方设置有定点旋转装置，定点旋转装置的一端设置有定点；可调谐双波长输出激光器产生两束泵浦光，其中一束泵浦光经过全反射镜反射至布儒斯特窗并与另一束泵浦光共线射至微腔，形成太赫兹波射至接收窗口。The present invention adopts the following technical solutions to achieve the above object. A device for generating tunable terahertz waves in a microcavity, comprising a tunableCO2 laser discharge cavity, two extracavity gratings are arranged side by side on the left side of the tunableCO2 laser discharge cavity, the extracavity grating and the adjustable The tunable CO2 laser discharge cavity constitutes a tunable dual-wavelength output laser. A total reflection mirror and a Brewster window are arranged on the right side of the tunable CO2 laser discharge cavity, and the total reflection mirror and the Brewster window are respectively connected to the extracavity grating Correspondingly; a microcavity and a receiving window are arranged in turn on the outside of the Brewster window, a fixed-point rotating device is arranged under the microcavity, and a fixed point is arranged at one end of the fixed-point rotating device; the tunable dual-wavelength output laser generates two pump beams One beam of pump light is reflected by the total reflection mirror to the Brewster window and collinearly transmitted to the microcavity with the other beam of pump light, forming a terahertz wave and transmitted to the receiving window.
一种在微腔中产生可调谐太赫兹波的方法，其步骤如下：A method for generating tunable terahertz waves in a microcavity, the steps of which are as follows:
1)利用可调谐双波长输出激光器，产生两束可调谐的泵浦光；1) Using a tunable dual-wavelength output laser to generate two tunable pump lights;
2)使两束泵浦光的传播方向水平共线；2) Make the propagation directions of the two beams of pump light collinear horizontally;
3)微腔的边缘放置在泵浦光的光路上；3) The edge of the microcavity is placed on the optical path of the pump light;
4)通过对所述微腔进行定点旋转引起入射光的偏转角度发生变化，从而改变腔相位匹配的周期，实现太赫兹波的可调谐输出。4) By rotating the microcavity at a fixed point, the deflection angle of the incident light changes, thereby changing the phase matching period of the cavity, and realizing the tunable output of the terahertz wave.
进一步，所述泵浦光的波长范围为9um～11um。Further, the wavelength range of the pump light is 9um-11um.
进一步，所述微腔的两壁在泵浦光频段均为高反，反射率高达99％，左壁在太赫兹频段为高反，反射率高达99％，右壁在太赫兹频段为高透射，两壁之间是各向同性的非线性晶体，晶体的长度与入射泵浦光偏转角度余弦的比值满足腔相位匹配条件。Further, both walls of the microcavity are highly reflective in the pump light frequency band, with a reflectivity as high as 99%, the left wall is highly reflective in the terahertz frequency band, and the reflectivity is as high as 99%, and the right wall is highly transmissive in the terahertz frequency band. , between the two walls is an isotropic nonlinear crystal, and the ratio of the length of the crystal to the cosine of the deflection angle of the incident pump light satisfies the cavity phase matching condition.
进一步，所述偏转角度是指泵浦光的传播方向与微腔边缘的夹角。Further, the deflection angle refers to the angle between the propagation direction of the pump light and the edge of the microcavity.
进一步，所述非线性晶体包括GaP、InP、CdTe和ZnGeP2晶体。Further, the nonlinear crystals include GaP, InP, CdTe and ZnGeP2 crystals.
进一步，所述入射泵浦光偏转角度余弦的比值是：式中：L是微腔的腔长，θ是偏转角度。Further, the ratio of the incident pump light deflection angle cosine is: In the formula: L is the cavity length of the microcavity, θ is the deflection angle.
一种在微腔中产生可调谐太赫兹波的方法可应用于医学、环境安全和通讯领域。A method for generating tunable terahertz waves in a microcavity could have applications in medicine, environmental safety, and communications.
上述对该微腔进行定点旋转的定点位于泵浦光在微腔中的入射点，与传统的角度相位匹配中通过改变角度来满足不同波长其折射率之间的相位匹配条件不同，在这里入射泵浦光偏转角度的连续变化实际上是连续改变了腔相位匹配过程中的周期，从而达到产生可调谐太赫兹的目的，与角度相位匹配调谐技术有本质的区别。The fixed point for the above-mentioned fixed-point rotation of the microcavity is located at the incident point of the pump light in the microcavity, which is different from the traditional angular phase matching in which the phase matching conditions between the refractive indices of different wavelengths are satisfied by changing the angle. Here, the incident The continuous change of the deflection angle of the pump light actually changes the cycle of the phase matching process of the cavity continuously, so as to achieve the purpose of generating tunable terahertz, which is essentially different from the angle phase matching tuning technology.
本发明中微腔的设置对CO2激光的利用率非常高，调谐范围广，非线性转换效率显著增加；通过简单的对微腔整体进行定点旋转即可实现太赫兹波的可调谐输出；在微腔定点旋转的情况下，由于泵浦光的入射方向一直是水平方向，因此所产生的太赫兹波也是固定水平输出，如此便对产生的太赫兹波进行探测带来了便利；整个系统制作简单且结构简单小巧方便，容易集成，可室温下运转，是未来太赫兹辐射源发展的一种趋势。The setting of the microcavity in the present invention has a very high utilization rate of theCO2 laser, a wide tuning range, and a significant increase in nonlinear conversion efficiency; the tunable output of the terahertz wave can be realized by simply rotating the microcavity as a whole; In the case of fixed-point rotation of the microcavity, since the incident direction of the pump light is always in the horizontal direction, the generated terahertz wave is also output at a fixed level, which brings convenience to the detection of the generated terahertz wave; the whole system fabrication Simple and simple in structure, compact and convenient, easy to integrate, and can operate at room temperature, it is a trend in the development of terahertz radiation sources in the future.
附图说明Description of drawings
图1是本发明实施例的实现装置示意图；Fig. 1 is a schematic diagram of an implementation device of an embodiment of the present invention;
图2是本发明实施例泵浦光λp、λs在某一偏转角度时的微腔结构和光路示意图；2 is a schematic diagram of the microcavity structure and optical path of pumping light λp and λs at a certain deflection angle according to an embodiment of the present invention;
图3是本发明实施例基于腔长和一束泵浦光(λp)波长固定，入射光偏转角度在0-90°范围内与产生的太赫兹波长的关系示意图。Fig. 3 is a schematic diagram of the relationship between the deflection angle of the incident light in the range of 0-90° and the generated terahertz wavelength based on the cavity length and the fixed wavelength of a beam of pump light (λp) according to the embodiment of the present invention.
图中：1、2.腔外光栅，3.可调谐CO2激光器放电腔，4.全反射镜，5.布儒斯特窗，6.微腔，7.定点，8.旋转装置，9.接收窗口。In the figure: 1, 2. Extracavity grating, 3. Tunable CO2 laser discharge cavity, 4. Total reflection mirror, 5. Brewster window, 6. Microcavity, 7. Fixed point, 8. Rotating device, 9. receive window.
具体实施方式detailed description
以下结合附图和实施例对本发明作进一步详述。参见图1至图3，一种在微腔6中产生可调谐太赫兹波的装置，包括可调谐CO2激光器放电腔3，所述可调谐CO2激光器放电腔3的左侧并列设置有腔外光栅1、2，腔外光栅1、2和可调谐CO2激光器放电腔3构成可调谐双波长输出激光器10，在可调谐CO2激光器放电腔3的右侧设置有全反射镜4和布儒斯特窗5，且全反射镜4和布儒斯特窗5分别与腔外光栅1、2对应；在布儒斯特窗5的外侧依次设置有微腔6和接收窗口9，所述微腔6的下方设置有定点旋转装置8，定点旋转装置8的一端设置有定点7；可调谐双波长输出激光器10产生二束泵浦光λp、λs，其中一束泵浦光λs经过全反射镜4反射至布儒斯特窗5并与另一束泵浦光λp共线射至微腔6，形成太赫兹波射至接收窗口9。The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Referring to Figures 1 to 3, a device for generating tunable terahertz waves in a microcavity 6 includes a tunableCO2 laser discharge cavity 3, and a cavity is arranged side by side on the left side of the tunableCO2 laser discharge cavity 3 The external grating 1, 2, the extracavity grating 1, 2 and the tunableCO2 laser discharge cavity 3 constitute a tunable dual-wavelength output laser 10, and a total reflection mirror 4 and a Buru are arranged on the right side of the tunableCO2 laser discharge cavity 3 The Brewster window 5, and the total reflection mirror 4 and the Brewster window 5 correspond to the extracavity gratings 1 and 2 respectively; a microcavity 6 and a receiving window 9 are sequentially arranged outside the Brewster window 5, and the microcavity 6 is provided with a fixed-point rotating device 8, and one end of the fixed-point rotating device 8 is provided with a fixed point 7; the tunable dual-wavelength output laser 10 generates two beams of pumping light λp, λs, and one beam of pumping light λs passes through the total reflection mirror 4 It is reflected to the Brewster window 5 and is transmitted to the microcavity 6 collinearly with another beam of pump light λp to form a terahertz wave to the receiving window 9 .
一种在微腔6中产生可调谐太赫兹波的方法，其步骤如下：A method for generating tunable terahertz waves in a microcavity 6, the steps of which are as follows:
1)利用可调谐双波长输出激光器10，产生两束可调谐的泵浦光λp、λs；所述泵浦光λp、λs的波长范围为9um～11um。1) Using the tunable dual-wavelength output laser 10 to generate two beams of tunable pump light λp, λs; the wavelength range of the pump light λp, λs is 9um-11um.
2)使两束泵浦光λp、λs的传播方向水平共线；2) Make the propagation directions of the two beams of pump light λp and λs horizontally collinear;
3)微腔6的边缘放置在激光束的光路上；所述微腔6的两壁在泵浦光λp、λs频段均为高反，反射率高达99％，左壁在太赫兹频段为高反，反射率高达99％，右壁在太赫兹频段为高透射，两壁之间是各向同性的非线性晶体，晶体的长度与入射泵浦光λp、λs偏转角度θ余弦的比值满足腔相位匹配条件。所述入射泵浦光λp、λs的偏转角度θ是指激光的传播方向与微腔边缘的夹角(参见图2，泵浦光λp、λs在某一偏转角度时的光路示意图)。所述非线性晶体包括GaP、InP、CdTe和ZnGeP2晶体。3) The edge of the microcavity 6 is placed on the optical path of the laser beam; the two walls of the microcavity 6 are highly reflective in the pump light λp and λs frequency bands, and the reflectivity is as high as 99%, and the left wall is high in the terahertz frequency band. On the contrary, the reflectivity is as high as 99%, the right wall is high transmission in the terahertz frequency band, and there is an isotropic nonlinear crystal between the two walls. The ratio of the length of the crystal to the deflection angle θ cosine of the incident pump light λp and λs Satisfy the cavity phase matching condition. The deflection angle θ of the incident pump light λp, λs refers to the angle between the propagation direction of the laser light and the edge of the microcavity (see FIG. 2, the schematic diagram of the optical path of the pump light λp, λs at a certain deflection angle). The nonlinear crystals include GaP, InP, CdTe and ZnGeP2 crystals.
4)通过对所述微腔6进行定点旋转引起入射泵浦光λp、λs的偏转角度发生变化，从而改变腔相位匹配的周期，实现太赫兹波的可调谐输出。4) By rotating the microcavity 6 at a fixed point, the deflection angles of the incident pump light λp and λs are changed, thereby changing the period of cavity phase matching and realizing tunable output of terahertz waves.
本发明是基于两束不同波长的泵浦光λp、λs水平入射到定点旋转的微腔6中，根据腔相位匹配的条件，由微腔6的定点旋转导致入射泵浦光λp、λs偏转角度的变化来引起腔相位匹配周期的变化，从而产生可调谐太赫兹波。在此过程中，两束波长接近的泵浦光λp、λs和太赫兹波同时满足能量守恒条件和腔相位匹配条件，腔相位匹配是指在微腔中三波耦合传播到相位失配为π的时候，利用微腔两壁对泵浦光的全反射，引入了额外的π相位来补偿相位失配，使得在整个微腔长度L范围内实现非线性光学转换效率持续增加。这个过程与准相位匹配的过程十分相似，不同之处在于腔相位匹配不需要改变非线性晶体的非线性光学系数的符号而是改变波的传播方向。在腔相位匹配中微腔6的结构如图1所示，L是微腔6的长度。本实施例采用一阶腔相位匹配，该微腔中的非线性晶体为GaP晶体(适用于其它非线性晶体InP、CdTe和ZnGeP2等)。微腔6的长度根据能量守恒定律如公式(1)和腔相位匹配条件如公式(2)决定：The present invention is based on the fact that two beams of pump light λp and λs of different wavelengths are horizontally incident into the fixed-point rotating microcavity 6, and according to the condition of cavity phase matching, the deflection angle of the incident pump light λp and λs is caused by the fixed-point rotation of the microcavity 6 The change of the cavity phase matching cycle is caused by the change, thereby generating tunable terahertz waves. During this process, the two beams of pump light λp, λs and terahertz waves with similar wavelengths simultaneously satisfy the energy conservation condition and the cavity phase matching condition. At that time, the total reflection of the pump light by the two walls of the microcavity was used to introduce an additional π phase to compensate for the phase mismatch, so that the nonlinear optical conversion efficiency continued to increase within the entire microcavity length L. This process is very similar to the process of quasi-phase matching, the difference is that cavity phase matching does not need to change the sign of the nonlinear optical coefficient of the nonlinear crystal but changes the propagation direction of the wave. The structure of the microcavity 6 in cavity phase matching is shown in FIG. 1 , and L is the length of the microcavity 6 . This embodiment adopts first-order cavity phase matching, and the nonlinear crystal in the microcavity is GaP crystal (applicable to other nonlinear crystals InP, CdTe and ZnGeP2, etc.). The length of the microcavity 6 is determined according to the law of energy conservation such as formula (1) and cavity phase matching conditions such as formula (2):
ΔK＝kp-ks-kT； (3)ΔK=kp -ks -kT ; (3)
其中：λp，λs为波长接近的两束泵浦光，λT为生成光THz波的波长,kP、kskT分别是泵浦光、信号光和THz波的波矢，θ是偏转角度，如图1所示。在对微腔6进行定点旋转时会引起入射光偏转角度的变化，而偏转角度的改变将引起腔相位匹配周期的变化，在一道泵浦光(λp或λs)和腔长L确定的情况下，根据式(1)和(2)便可实现可调谐太赫兹波的输出。Among them: λp, λs are the two pump lights with similar wavelengths, λT is the wavelength of the THz wave of the generated light, kP , ks kT are the wave vectors of the pump light, signal light and THz wave, respectively, θ is the deflection angle, as shown in Figure 1. When the microcavity 6 is rotated at a fixed point, it will cause a change in the deflection angle of the incident light, and the change in the deflection angle will cause a change in the phase matching period of the cavity. In the case of a pump light (λp or λs) and the cavity length L being determined , according to equations (1) and (2), the output of tunable terahertz waves can be realized.
实施例：Example:
如图1所示，利用一台可调谐双波长输出激光器10产生泵浦光λp、λs，腔外光栅1、2产生两束可调谐波长范围在9um到11um的泵浦光，通过改变腔外光栅1、2的角度可以改变泵浦光λp、λs的波长。泵浦光λp、λs经过可调谐CO2激光器放电腔3进行功率放大。泵浦光λs经全反射镜4反射至布儒斯特窗5，布儒斯特窗5使泵浦光λp透射，透射率大于90％，使泵浦光λs反射，反射率大于90％，最终两束泵浦光λp、λs在方向水平共线，与微腔6边缘的初始位置持平。定点7(如图1所示)，在微腔6中的是各向同性非线性晶体，如GaP晶体(也适用于其他各向同性的非线性晶体)，通过旋转装置8引起入射泵浦光λp、λs的偏转角度发生变化，从而改变腔相位匹配的周期，根据式(1)和(2)便可以实现太赫兹波的可调谐输出，是太赫兹波的接收窗口9。该实施例具有转换效率高，结构简单小巧，制作方便，室温下运转等显著特点。As shown in Figure 1, a tunable dual-wavelength output laser 10 is used to generate pumping light λp, λs, and extracavity gratings 1 and 2 generate two beams of pumping light with tunable wavelengths ranging from 9um to 11um. The angles of the gratings 1 and 2 can change the wavelengths of the pump light λp and λs. The pumping light λp, λs is amplified through the discharge cavity 3 of the tunable CO2 laser. The pump light λs is reflected by the total reflection mirror 4 to the Brewster window 5, and the Brewster window 5 transmits the pump light λp with a transmittance greater than 90%, and reflects the pump light λs with a reflectivity greater than 90%. Finally, the two beams of pump light λp and λs are horizontally collinear in direction, which is equal to the initial position of the edge of the microcavity 6 . Fixed point 7 (as shown in Figure 1), in the microcavity 6 is an isotropic nonlinear crystal, such as GaP crystal (also applicable to other isotropic nonlinear crystals), and the incident pumping light is caused by the rotating device 8 The deflection angles of λp and λs change, thereby changing the cycle of cavity phase matching. According to formulas (1) and (2), the tunable output of terahertz waves can be realized, which is the receiving window of terahertz waves9. This embodiment has the remarkable characteristics of high conversion efficiency, simple and compact structure, convenient manufacture, and operation at room temperature.
图3为在该实施例的情况下，泵浦光λp＝9.4731um(9P10支线)，微腔的腔长L＝500um，通过改变泵浦光λs的波长时，入射泵浦光λp、λs的偏转角度与产生的太赫兹波长的理论调谐曲线图。从图3中可以看出，入射光的偏转角度在0°到90°的范围内连续变化时，产生的太赫兹波长随着入射泵浦光λp、λs偏转角度的增大而增大。Fig. 3 is under the situation of this embodiment, pumping light λp=9.4731um (9P10 branch line), the cavity length L=500um of microcavity, when by changing the wavelength of pumping light λs, incident pumping light λp, λs Theoretical tuning plot of the deflection angle versus the resulting terahertz wavelength. It can be seen from Figure 3 that when the deflection angle of the incident light changes continuously in the range of 0° to 90°, the generated terahertz wavelength increases with the increase of the deflection angle of the incident pump light λp and λs.
| Application Number | Priority Date | Filing Date | Title |
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| CN201710450607.3ACN107017543A (en) | 2017-06-15 | 2017-06-15 | Device and method for generating tunable terahertz waves in a microcavity |
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| CN201710450607.3ACN107017543A (en) | 2017-06-15 | 2017-06-15 | Device and method for generating tunable terahertz waves in a microcavity |
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| CN107017543Atrue CN107017543A (en) | 2017-08-04 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201710450607.3APendingCN107017543A (en) | 2017-06-15 | 2017-06-15 | Device and method for generating tunable terahertz waves in a microcavity |
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| CN110391580A (en)* | 2018-04-17 | 2019-10-29 | 中国科学院大连化学物理研究所 | A cesium terahertz collimated light source device and system |
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| CN102412495A (en)* | 2011-09-09 | 2012-04-11 | 华中科技大学 | CO2 Laser Generation of Tunable Terahertz Waves in Sector-shaped Periodic Crystals |
| CN102412496A (en)* | 2011-10-22 | 2012-04-11 | 西北大学 | Non-linear optical difference frequency technology-based terahertz wave radiation source |
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| CN102412495A (en)* | 2011-09-09 | 2012-04-11 | 华中科技大学 | CO2 Laser Generation of Tunable Terahertz Waves in Sector-shaped Periodic Crystals |
| CN102412496A (en)* | 2011-10-22 | 2012-04-11 | 西北大学 | Non-linear optical difference frequency technology-based terahertz wave radiation source |
| CN105261915A (en)* | 2015-11-17 | 2016-01-20 | 天津大学 | Compact type optical difference-frequency THz source |
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| CN110391580B (en)* | 2018-04-17 | 2021-05-25 | 中国科学院大连化学物理研究所 | Cesium terahertz collimated light source device and system |
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