CN205122984U - Compact optics difference frequency terahertz is source now - Google Patents
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Abstract
本实用新型公开了一种紧凑的光学差频太赫兹源，包括依次设置的双波长激光器和差频装置，双波长激光器由依次设置的泵浦源、激光反射镜、激光晶体、Q开关和激光输出镜构成；差频装置由依次设置的激光聚焦镜和差频晶体构成；所述泵浦源发出的泵浦激光注入激光晶体，激光晶体内的激活粒子在泵浦光作用下跃迁到上能级并在由所述激光反射镜和激光输出镜构成的谐振腔内产生激光振荡，激光晶体由两块晶体构成用于产生两个波长的激光振荡，通过所述Q开关实现脉冲激光输出，输出的激光经所述激光聚焦镜聚焦后注入所述差频晶体发生差频效应，产生太赫兹波并输出。本实用新型太赫兹源结构紧凑，适用于低成本、小型化、便携式太赫兹源的需求场合。
The utility model discloses a compact optical difference-frequency terahertz source, which comprises a double-wavelength laser and a difference-frequency device arranged in sequence. The double-wavelength laser consists of a pumping source, a laser reflector, a laser crystal, a Q switch and a laser The output mirror is composed of an output mirror; the difference frequency device is composed of a laser focusing mirror and a difference frequency crystal arranged in sequence; the pump laser emitted by the pump source is injected into the laser crystal, and the activated particles in the laser crystal transition to the upper energy level under the action of the pump light. stage and generate laser oscillation in the resonant cavity composed of the laser reflector and the laser output mirror. The laser crystal is composed of two crystals to generate laser oscillation with two wavelengths. The pulsed laser output is realized through the Q switch, and the output The laser beam is focused by the laser focusing mirror and then injected into the difference frequency crystal to generate a difference frequency effect to generate and output terahertz waves. The terahertz source of the utility model has a compact structure, and is suitable for occasions where low-cost, miniaturized, and portable terahertz sources are required.
Description
技术领域technical field
本实用新型涉及固体激光器及非线性光学频率变换领域，更具体的说，是涉及一种紧凑稳定双波长激光器及光学差频太赫兹源。The utility model relates to the field of solid-state lasers and nonlinear optical frequency conversion, more specifically, relates to a compact and stable dual-wavelength laser and an optical difference frequency terahertz source.
背景技术Background technique
太赫兹(Terahertz或THz)辐射是频率在0.1-10THz，典型中心频率为1THz的电磁波，其波段介于微波和红外线之间，是宏观电子学向微观光子学过渡的重要电磁波段。太赫兹波在物理、化学、天文学、分子光谱、生命科学和医药科学等基础研究领域，以及医学成像、安全检查、环境监测、材料分析、食品检测、射电天文、移动通讯、卫星通信和军用雷达等应用研究领域均有重大的科学研究价值和广阔的应用前景。Terahertz (Terahertz or THz) radiation is an electromagnetic wave with a frequency of 0.1-10THz and a typical center frequency of 1THz. Its wave band is between microwave and infrared, and it is an important electromagnetic wave band for the transition from macroelectronics to microphotonics. Terahertz waves are used in basic research fields such as physics, chemistry, astronomy, molecular spectroscopy, life science and medical science, as well as medical imaging, security inspection, environmental monitoring, material analysis, food testing, radio astronomy, mobile communication, satellite communication and military radar and other applied research fields have great scientific research value and broad application prospects.
光学差频(DFG)是获得小型化室温运转的窄带、高峰值功率、宽调谐THz辐射源的最佳方法之一。差频的非线性过程简单有效，没有阈值，不需要谐振腔，稳定性好。差频产生太赫兹波的技术可以追溯到上世纪60年代，但由于当时的激光技术和光学频率变换技术水平的限制，转换效率非常低。直到上世纪90年代后期，随着小型化全固态激光技术、高质量非线性晶体生长技术的进步以及太赫兹波的相关理论及其应用研究的兴起，差频产生太赫兹辐射的研究又成为太赫兹领域的一个研究热点。美国、日本、欧洲等发达国家以及我国的多个课题组对差频的相关理论和技术进行了深入研究。目前国内外已报道的结果中，差频方法已经可以实现低重复频率或高重复频率的脉冲运转甚至连续波运转，调谐范围覆盖0.1-30THz，输出线宽可以窄至10MHz，差频太赫兹源的峰值功率可达到千瓦(kW)甚至兆瓦(MW)量级，平均功率可以达到毫瓦量级。利用差频产生的太赫兹辐射可以对物体进行实时成像，也可以对某些物质的宽波段太赫兹谱进行检测，其极窄带的特性甚至可以清晰地分辨出某些分子的振动或转动模式。Optical difference frequency (DFG) is one of the best ways to obtain narrowband, high peak power, wide tunable THz radiation sources that operate at room temperature in a miniaturized form. The non-linear process of the difference frequency is simple and effective, there is no threshold, no resonant cavity is needed, and the stability is good. The technology of generating terahertz waves by difference frequency can be traced back to the 1960s, but due to the limitations of laser technology and optical frequency conversion technology at that time, the conversion efficiency was very low. Until the late 1990s, with the advancement of miniaturized all-solid-state laser technology, high-quality nonlinear crystal growth technology, and the rise of related theories and applications of terahertz waves, the research on terahertz radiation generated by difference frequency has become one of the most A research hotspot in the field of Hertz. Developed countries such as the United States, Japan, Europe, and many research groups in my country have conducted in-depth research on the related theories and technologies of difference frequency. Among the results reported at home and abroad, the difference frequency method can already achieve low or high repetition frequency pulse operation or even continuous wave operation. The tuning range covers 0.1-30THz, and the output linewidth can be as narrow as 10MHz. The difference frequency terahertz source The peak power can reach the kilowatt (kW) or even megawatt (MW) level, and the average power can reach the milliwatt level. The terahertz radiation generated by the difference frequency can be used to image objects in real time, and can also detect the wide-band terahertz spectrum of some substances. Its extremely narrow-band characteristics can even clearly distinguish the vibration or rotation modes of some molecules.
利用低重复频率、高单能量脉冲能量的双波长激光差频可以获得较高单脉冲能量的太赫兹波，但由于重复频率低，平均功率无法有效提高，不利于快速成像等对太赫兹源功率有要求的场合。利用连续半导体激光器泵浦的双波长激光器差频可以产生高平均功率、高重复频率的太赫兹源，2010年美国LehighUniversity的PuZhao等报道了利用半导体激光器端面泵浦一块Nd:YLF晶体产生1047/1053nm双波长激光(OpticsLetters，2010，35(23)：3979-3981)，两个波长在两个谐振腔中振荡，经合束后在GaSe中差频产生了1.64THz辐射输出，但由于两个波长在晶体中有增益竞争，因此双波长的功率不稳定，产生的太赫兹功率也不稳定。2011年该研究小组对实验装置进行了改进(AppliedPhysicsLetters，2011，98：131106)，利用两台半导体激光器泵浦两块Nd:YLF晶体，在两个谐振腔中产生双波长激光并通过差频产生太赫兹波，该方案克服了增益竞争问题，双波长激光及太赫兹波的稳定性大大提高。但采用两台半导体激光器及两个谐振腔的方案大大增加了成本，也不利于双波长激光器及整体太赫兹源的小型化。The terahertz wave with higher single pulse energy can be obtained by using the dual-wavelength laser difference frequency with low repetition rate and high single energy pulse energy, but due to the low repetition frequency, the average power cannot be effectively improved, which is not conducive to rapid imaging and other terahertz source power. Occasionally required. The difference frequency of the dual-wavelength laser pumped by the continuous semiconductor laser can produce a terahertz source with high average power and high repetition rate. In 2010, Pu Zhao from Lehigh University in the United States reported that a Nd:YLF crystal was end-pumped by a semiconductor laser to produce 1047/1053nm Dual-wavelength laser (OpticsLetters, 2010, 35(23): 3979-3981), two wavelengths oscillate in two resonant cavities. There is gain competition in the crystal, so the power at the dual wavelengths is unstable, and the generated terahertz power is also unstable. In 2011, the research team improved the experimental device (AppliedPhysicsLetters, 2011, 98: 131106), using two semiconductor lasers to pump two Nd:YLF crystals, generating dual-wavelength lasers in the two resonators and generating them by difference frequency For terahertz waves, this solution overcomes the problem of gain competition, and the stability of dual-wavelength lasers and terahertz waves is greatly improved. However, the scheme of using two semiconductor lasers and two resonators greatly increases the cost, and is not conducive to the miniaturization of the dual-wavelength laser and the overall terahertz source.
实用新型内容Utility model content
本实用新型的目的是为了克服现有技术中的不足，提供一种紧凑稳定双波长激光光学差频太赫兹源。The purpose of the utility model is to overcome the deficiencies in the prior art and provide a compact and stable double-wavelength laser optical difference frequency terahertz source.
本实用新型的目的是通过以下技术方案实现的：The purpose of this utility model is achieved through the following technical solutions:
一种紧凑的光学差频太赫兹源，包括依次设置的双波长激光器和差频装置，所述双波长激光器由依次设置的泵浦源、激光反射镜、激光晶体、Q开关和激光输出镜构成；差频装置由依次设置的激光聚焦镜和差频晶体构成；所述泵浦源发出的泵浦激光注入激光晶体，激光晶体内的激活粒子在泵浦光作用下跃迁到上能级并在由所述激光反射镜和激光输出镜构成的谐振腔内产生激光振荡，所述激光晶体由两块晶体构成用于产生两个波长的激光振荡，通过所述Q开关调节谐振腔的损耗，实现脉冲激光输出，输出的激光经所述激光聚焦镜聚焦后注入所述差频晶体发生差频效应，产生太赫兹波并输出。A compact optical difference frequency terahertz source, including a dual-wavelength laser and a difference frequency device arranged in sequence, the dual-wavelength laser is composed of a pump source, a laser mirror, a laser crystal, a Q switch and a laser output mirror arranged in sequence The difference frequency device is composed of a laser focusing mirror and a difference frequency crystal arranged in sequence; the pump laser emitted by the pump source is injected into the laser crystal, and the activated particles in the laser crystal transition to the upper energy level under the action of the pump light and Laser oscillation is generated in the resonant cavity formed by the laser reflector and the laser output mirror, and the laser crystal is composed of two crystals for generating laser oscillation of two wavelengths, and the loss of the resonant cavity is adjusted through the Q switch to realize The pulsed laser is output, and the output laser is focused by the laser focusing mirror and then injected into the difference frequency crystal to produce a difference frequency effect to generate a terahertz wave and output it.
所述泵浦源由带有聚焦透镜的直接输出半导体激光器或光纤耦合输出半导体激光器构成；所述泵浦源发出泵浦激光的波长范围为800～810nm或880～890nm，所述泵浦源发出的泵浦激光波长通过改变泵浦源所在的工作温度进行调节。The pump source is composed of a direct output semiconductor laser or a fiber-coupled output semiconductor laser with a focusing lens; the wavelength range of the pump laser emitted by the pump source is 800-810nm or 880-890nm, and the pump source emits The wavelength of the pump laser is adjusted by changing the operating temperature where the pump source is located.
所述激光晶体产生的波长范围在900-950nm波段、1040-1080nm波段和1300-1350nm波段中的任意一段。The wavelength range generated by the laser crystal is any one of 900-950nm wave band, 1040-1080nm wave band and 1300-1350nm wave band.
所述激光晶体的每个通光面均镀有泵浦光及振荡激光增透膜。Each light-transmitting surface of the laser crystal is coated with an anti-reflection film for pumping light and oscillating laser.
所述激光晶体由两块不同种类晶体构成，激光晶体为Nd:YAG、Nd:YVO4、Nd:GdVO4、Nd:YLF、Nd:YAP和Nd:GGG晶体中的任意两个晶体的组合，其中Nd3+的掺杂浓度为0.1-3ad％。The laser crystal is composed of two different types of crystals, and the laser crystal is a combination of any two crystals of Nd:YAG, Nd:YVO 4 , Nd:GdVO 4 , Nd:YLF, Nd:YAP and Nd:GGG crystals, Wherein the doping concentration of Nd3+ is 0.1-3ad%.
所述激光晶体由两块相同种类晶体构成，两块晶体的切割轴向不同或两块晶体的切割轴向相同，但是其中一块晶体的主轴相对另一块晶体沿通光方向旋转90°。The laser crystal is composed of two crystals of the same type, the cutting axes of the two crystals are different or the cutting axes of the two crystals are the same, but the main axis of one crystal is rotated 90° relative to the other crystal along the direction of light transmission.
所述激光反射镜镀有泵浦光增透膜及振荡激光高反膜，所述激光输出镜对振荡激光的反射率为40％～99％；所述激光反射镜的镜片和激光输出镜的镜片由平面镜、平凹镜或双凹镜其中的任意一个构成。The laser reflector is coated with pump light anti-reflection film and oscillating laser high reflection film, and the reflectivity of the laser output mirror to the oscillating laser is 40% to 99%; the lens of the laser reflector and the laser output mirror The lens is composed of any one of plane mirror, plano-concave mirror or bi-concave mirror.
所述Q开关由声光Q开关、电光Q开关和可饱和吸收体被动Q开关其中任意一种构成；所述Q开关的工作频率为1kHz至300kHz。The Q-switch is composed of any one of an acousto-optic Q-switch, an electro-optic Q-switch and a saturable absorber passive Q-switch; the operating frequency of the Q-switch is 1 kHz to 300 kHz.
所述激光聚焦镜为凸透镜或缩束望远镜。The laser focusing mirror is a convex lens or a shrinking telescope.
所述差频晶体由GaSe、ZnGeP2、GaAs、ZnTe、GaP或DAST其中的一种构成，所述差频晶体实现差频产生太赫兹波需满足角度相位匹配、温度相位匹配或准相位匹配。The difference frequency crystal is composed of one of GaSe, ZnGeP 2 , GaAs, ZnTe, GaP or DAST. The difference frequency crystal needs to satisfy angle phase matching, temperature phase matching or quasi phase matching to realize difference frequency generation of terahertz wave.
所述泵浦源输出的泵浦光聚焦点在激光晶体所包含的两块晶体结合面附近。The focal point of the pumping light output by the pumping source is near the joint surface of the two crystals included in the laser crystal.
所述双波长激光器可以通过改变泵浦源的输出波长来调节两个激光波长的相对功率。The dual-wavelength laser can adjust the relative power of the two laser wavelengths by changing the output wavelength of the pump source.
所述由激光反射镜和激光输出镜构成的谐振腔内可以加入偏振器件实现激光线的偏振运转。A polarization device can be added in the resonant cavity formed by the laser reflector and the laser output mirror to realize the polarization operation of the laser line.
与现有技术相比，本实用新型的技术方案所带来的有益效果是：Compared with the prior art, the beneficial effects brought by the technical solution of the utility model are:
本实用新型中泵浦源发出的泵浦激光注入激光晶体，激光晶体由两块晶体组成以分别产生不同波长的激光振荡，两块晶体既可以是同类晶体采用不同切割方向或不同放置轴向的组合，也可以采用不同类晶体的组合，激光晶体的激活粒子在泵浦光作用下跃迁到上能级并在激光反射镜和激光输出镜构成的谐振腔内产生激光振荡，通过Q开关调节谐振腔的损耗，实现双波长的脉冲激光输出，双波长激光中两个波长的相对功率可以通过调节泵浦波长来调节，以达到最佳差频效果，输出的激光经激光聚焦镜聚焦后注入差频晶体发生差频效应，产生太赫兹波并输出；由于双波长激光共用同一个泵浦源及谐振腔，因此本实用新型整体太赫兹源结构非常紧凑，适用于低成本、小型化、便携式太赫兹源的需求场合。In the utility model, the pump laser light emitted by the pump source is injected into the laser crystal. The laser crystal is composed of two crystals to generate laser oscillations of different wavelengths respectively. The two crystals can be of the same type with different cutting directions or different placement axes The combination of different types of crystals can also be used. The active particles of the laser crystal jump to the upper energy level under the action of the pump light and generate laser oscillation in the resonant cavity formed by the laser reflector and the laser output mirror. The resonance is adjusted by the Q switch The loss of the cavity realizes the dual-wavelength pulsed laser output. The relative power of the two wavelengths in the dual-wavelength laser can be adjusted by adjusting the pump wavelength to achieve the best difference frequency effect. The output laser is focused by the laser focusing lens and injected into the difference The difference frequency effect occurs in the high-frequency crystal to generate and output terahertz waves; since the dual-wavelength lasers share the same pump source and resonant cavity, the overall terahertz source structure of the utility model is very compact, and is suitable for low-cost, miniaturized, portable terahertz Demand occasions for Hertz sources.
附图说明Description of drawings
图1是本实用新型的结构示意图。Fig. 1 is the structural representation of the utility model.
图2是本实用新型的具体实施例示意图。Fig. 2 is a schematic diagram of a specific embodiment of the utility model.
附图标记：1-泵浦源2-激光反射镜3-激光晶体4-Q开关5-激光输出镜6-激光聚焦镜7-差频晶体8-布儒斯特片Reference signs: 1-pump source 2-laser mirror 3-laser crystal 4-Q switch 5-laser output mirror 6-laser focusing mirror 7-difference frequency crystal 8-Brewster plate
具体实施方式detailed description
下面结合附图对本实用新型作进一步的描述：Below in conjunction with accompanying drawing, the utility model is further described:
如图1所示，一种紧凑的光学差频太赫兹源，包括依次设置的双波长激光器和差频装置，双波长激光器由依次设置的泵浦源1、激光反射镜2、激光晶体3、Q开关4和激光输出镜5构成；差频装置由依次设置的激光聚焦镜6和差频晶体7构成；泵浦源1发出的泵浦激光注入激光晶体3，激光晶体3内的激活粒子在泵浦光作用下跃迁到上能级并在由所述激光反射镜2和激光输出镜5构成的谐振腔内产生激光振荡，激光晶体3由两块晶体构成用于产生两个波长的激光振荡，通过所述Q开关4调节谐振腔的损耗，实现脉冲激光输出，输出的激光经所述激光聚焦镜6聚焦后注入所述差频晶体7发生差频效应，产生太赫兹波并输出。As shown in Figure 1, a compact optical difference-frequency terahertz source includes a dual-wavelength laser and a difference-frequency device arranged in sequence. The dual-wavelength laser consists of a pump source 1, a laser mirror 2, a laser crystal 3, and The Q switch 4 and the laser output mirror 5 are formed; the difference frequency device is composed of a laser focusing mirror 6 and a difference frequency crystal 7 arranged in sequence; the pumping laser light emitted by the pump source 1 is injected into the laser crystal 3, and the activated particles in the laser crystal 3 are Transition to the upper energy level under the action of the pump light and generate laser oscillation in the resonant cavity composed of the laser reflector 2 and the laser output mirror 5. The laser crystal 3 is composed of two crystals for generating laser oscillation of two wavelengths , adjust the loss of the resonant cavity through the Q switch 4 to realize pulsed laser output, the output laser is focused by the laser focusing mirror 6 and then injected into the difference frequency crystal 7 to produce a difference frequency effect to generate a terahertz wave and output it.
如图2所示为本实用新型的具体实施例示意图，泵浦源1采用光纤耦合输出且带有聚焦镜头的半导体激光器，常温下输出激光的中心波长为806nm，通过调节其工作温度，输出波长可在804-808nm范围内变化。传能光纤的芯径为400微米，数值孔径为0.22，泵浦源1所附带的聚焦透镜(1:2)将光纤传输的激光会聚为直径800微米的光斑入射到激光晶体3。As shown in Figure 2, it is a schematic diagram of a specific embodiment of the present utility model. The pump source 1 adopts a semiconductor laser that is coupled with an optical fiber and has a focusing lens. The central wavelength of the output laser at normal temperature is 806nm. It can be changed in the range of 804-808nm. The core diameter of the energy transmission fiber is 400 microns, and the numerical aperture is 0.22. The focusing lens (1:2) attached to the pump source 1 converges the laser light transmitted by the fiber into a spot with a diameter of 800 microns and enters the laser crystal 3 .
激光晶体3为Nd:YAG晶体与Nd:YLF晶体的组合，Nd:YAG晶体尺寸为4mm×4mm×7mm，<111>切割，Nd3+掺杂浓度为0.4ad％，两端面镀有800-810nm及1040-1070nm增透膜；Nd:YLF晶体尺寸为3mm×3mm×10mm，沿c轴切割，Nd3+掺杂浓度为1ad％，两块晶体紧靠放置，也可通过光胶结合为一体放置；激光反射镜2和激光输出镜5构成激光谐振腔，本实施例中激光反射镜2为平凹镜，凹面朝向腔内，平面和凹面均镀对泵浦光的增透膜，凹面还镀有对1040-1070nm波段的高反膜；激光输出镜5采用平面镜，对1040-1070nm波段的透过率约为30％。此外，在本实施例中由激光反射镜2和激光输出镜5构成的激光谐振腔内还插入有布儒斯特片8用来使激光线偏振运转；Q开关4用来使激光在高重复频率脉冲下运转，Q开关4具体为声光Q开关，声光介质为熔石英，介质长度为30mm，超声波工作频率为27.14MHz，驱动功率为20W，有效工作孔径1.8mm，调Q工作频率为10kHz。Laser crystal 3 is a combination of Nd:YAG crystal and Nd:YLF crystal. The size of Nd:YAG crystal is 4mm×4mm×7mm, <111> cut, Nd 3+ doping concentration is 0.4ad%, both sides are coated with 800- 810nm and 1040-1070nm anti-reflection coating; Nd:YLF crystal size is 3mm×3mm×10mm, cut along the c-axis, Nd 3+ doping concentration is 1ad%, two crystals are placed close to each other, and can also be combined by optical glue Placed in one piece; the laser reflector 2 and the laser output mirror 5 form a laser resonant cavity. In this embodiment, the laser reflector 2 is a plano-concave mirror with the concave surface facing the cavity. It is also coated with a high reflection film for the 1040-1070nm wave band; the laser output mirror 5 is a plane mirror, and the transmittance for the 1040-1070nm wave band is about 30%. In addition, in this embodiment, a Brewster plate 8 is inserted into the laser cavity formed by the laser reflection mirror 2 and the laser output mirror 5 to make the laser linearly polarized; the Q switch 4 is used to make the laser light at high repetition The Q switch 4 is specifically an acousto-optic Q switch, the acousto-optic medium is fused quartz, the medium length is 30mm, the ultrasonic working frequency is 27.14MHz, the driving power is 20W, the effective working aperture is 1.8mm, and the Q-switching working frequency is 10kHz.
当泵浦源1发出的泵浦激光注入激光晶体3时，激光晶体3包含的Nd:YAG和Nd:YLF吸收泵浦光，激活粒子的能态由基态跃迁到激发态，使泵浦光能量储存在激光上能级中，当声光Q开关4处于关闭状态时，上能级粒子数不断积累并产生大量反转粒子数，当声光Q开关4打开时，满足激光振荡条件，通过谐振腔的反馈迅速实现剧烈的受激辐射放大，在谐振腔内建立线偏振巨脉冲激光振荡，两晶体所产生激光波长分别为1064nm和1053nm，脉冲重复频率与调Q频率一致为10kHz；增加泵浦源1功率至16W，双波长激光的输出功率为4.5W，当泵浦源1工作温度29℃时(输出波长为804.4nm)两个波长的功率基本相等，脉冲宽度约为30ns。双波长激光经过激光聚焦镜6聚焦后入射到差频晶体7中进行频率变换，本实施例中差频晶体7具体为GaSe，晶体厚度8mm，旋转晶体角度满足相位匹配条件(相位匹配角内角5.95°，外角17°)，可以获得波长为102μm，频率为2.94THz的太赫兹波输出，输出平均功率约为10μW。整个太赫兹源的尺寸(不含半导体激光器及附带光纤)约为200mm(长)×50mm(宽)×50mm(高)，约为普通成人手掌大小，具有很好的便携性。When the pump laser light emitted by the pump source 1 is injected into the laser crystal 3, the Nd:YAG and Nd:YLF contained in the laser crystal 3 absorb the pump light, and the energy state of the activated particles transitions from the ground state to the excited state, making the energy of the pump light Stored in the upper energy level of the laser, when the acousto-optic Q switch 4 is turned off, the number of upper-level particles is continuously accumulated and a large number of reversed particle numbers are generated. When the acousto-optic Q switch 4 is turned on, the laser oscillation condition is met, and the resonance The feedback of the cavity quickly realizes the severe stimulated radiation amplification, and establishes a linearly polarized giant pulse laser oscillation in the resonator. The laser wavelengths generated by the two crystals are 1064nm and 1053nm respectively, and the pulse repetition frequency and Q-switching frequency are consistent at 10kHz; increase the pump The power of source 1 is up to 16W, and the output power of the dual-wavelength laser is 4.5W. When the operating temperature of pump source 1 is 29°C (the output wavelength is 804.4nm), the power of the two wavelengths is basically equal, and the pulse width is about 30ns. The dual-wavelength laser is focused by the laser focusing mirror 6 and then incident on the difference frequency crystal 7 for frequency conversion. In this embodiment, the difference frequency crystal 7 is specifically GaSe, the crystal thickness is 8mm, and the angle of the rotating crystal satisfies the phase matching condition (phase matching angle internal angle 5.95 °, outer angle 17°), the terahertz wave output with a wavelength of 102 μm and a frequency of 2.94 THz can be obtained, and the average output power is about 10 μW. The size of the entire terahertz source (excluding the semiconductor laser and the accompanying optical fiber) is about 200mm (length) × 50mm (width) × 50mm (height), which is about the size of an ordinary adult's palm and has good portability.
综上所述，本实用新型实施例提供了一种紧凑的光学差频太赫兹源，其关键部分的双波长激光器通过调节泵浦光波长来平衡两种激光晶体材料中的增益，从而输出稳定的双波长激光。由于双波长激光共用同一个泵浦源及谐振腔，因此整体太赫兹源结构非常紧凑，适用于低成本、小型化、便携式太赫兹源的需求场合。In summary, the embodiment of the utility model provides a compact optical difference-frequency terahertz source, and the dual-wavelength laser of its key part balances the gains in the two laser crystal materials by adjusting the wavelength of the pump light, so that the output is stable dual-wavelength laser. Since the dual-wavelength lasers share the same pump source and resonant cavity, the structure of the overall terahertz source is very compact, which is suitable for low-cost, miniaturized, and portable terahertz source applications.
以上所述仅为本实用新型的一个特定实施例，并不用以限制本实用新型，凡在本实用新型的精神和原则之内，所作的任何修改、等同替换、改进等，如基于本实用新型的紧凑稳定双波长激光器进行其他形式的频率变换，均应包含在本实用新型的保护范围之内。The above is only a specific embodiment of the utility model, and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model, such as based on the utility model The compact and stable dual-wavelength laser for other forms of frequency conversion should be included in the protection scope of the present utility model.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261915A (en) * | 2015-11-17 | 2016-01-20 | 天津大学 | Compact type optical difference-frequency THz source |
| CN106207717A (en) * | 2016-09-13 | 2016-12-07 | 华北水利水电大学 | A kind of multi beam terahertz radiation source of optically-based beat effect |
| CN109999360A (en) * | 2019-03-01 | 2019-07-12 | 钟海军 | A Terahertz Cell Physiotherapy Apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105261915A (en) * | 2015-11-17 | 2016-01-20 | 天津大学 | Compact type optical difference-frequency THz source |
| CN106207717A (en) * | 2016-09-13 | 2016-12-07 | 华北水利水电大学 | A kind of multi beam terahertz radiation source of optically-based beat effect |
| CN106207717B (en) * | 2016-09-13 | 2018-10-30 | 华北水利水电大学 | A kind of multi beam terahertz radiation source based on optical difference frequency effect |
| CN109999360A (en) * | 2019-03-01 | 2019-07-12 | 钟海军 | A Terahertz Cell Physiotherapy Apparatus |
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