CN114389138B - A Pulse Width Compressor Based on Stimulated Raman Scattering Secondary Amplification Structure - Google Patents
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Abstract
本发明为一种基于受激拉曼散射二次放大结构的脉宽压缩器，其特征在于，所述脉宽压缩器包括：泵浦源、分束镜、第一反射镜、凸透镜、SRS产生池和SRS二次放大系统；所述SRS二次放大系统包括第一二向色镜、第一SRS放大池、第二二向色镜、第二反射镜、第三反射镜、第二SRS放大池和第三二向色镜。泵浦光经过基于受激拉曼散射二次放大结构的压缩放大，可以获得较高的能量输出，相比于锁模激光器，可直接产生数十毫焦的皮秒激光。利用了SRS脉宽压缩技术对泵浦光进行压缩，由于其拉曼活性介质具有声子寿命短的特点，可以产生短脉冲激光。
The present invention is a pulse width compressor based on a stimulated Raman scattering secondary amplification structure, characterized in that the pulse width compressor includes: a pump source, a beam splitter, a first reflection mirror, a convex lens, and an SRS generating pool and SRS secondary amplification system; the SRS secondary amplification system includes a first dichroic mirror, a first SRS amplification pool, a second dichroic mirror, a second reflection mirror, a third reflection mirror, and a second SRS amplification pool and third dichroic mirror. The pump light is compressed and amplified based on the secondary amplification structure of stimulated Raman scattering, which can obtain higher energy output. Compared with the mode-locked laser, it can directly generate tens of millijoules of picosecond laser. The SRS pulse width compression technology is used to compress the pump light. Because the Raman active medium has the characteristics of short phonon lifetime, short pulse laser can be generated.
Description
技术领域technical field
本发明涉及短脉冲激光领域，尤其涉及一种基于受激拉曼散射二次放大结构的脉宽压缩器。The invention relates to the field of short pulse lasers, in particular to a pulse width compressor based on a secondary amplification structure of stimulated Raman scattering.
背景技术Background technique
超短脉冲激光在诸多领域有着广泛应用，超短脉冲激光可以大大提高激光测距的精度，为医疗仪器提供更有效、更安全的光源等等，在相关领域有着至关重要的作用。目前广泛产生超短脉冲激光的方法有调Q技术、锁模技术以及受激散射技术，调Q技术仅能产生纳秒或亚纳秒量级的激光脉冲；锁模技术产生的脉冲激光能量仅为微焦量级且结构复杂；受激布里渊散射(Stimulated Brillouin Scattering，SBS)脉宽压缩技术可以产生百皮秒级激光脉冲，但受限于光学击穿等非线性效应的产生，无法达到理论上的压缩极限。Ultrashort pulse lasers are widely used in many fields. Ultrashort pulse lasers can greatly improve the accuracy of laser ranging, provide more effective and safer light sources for medical instruments, etc., and play a vital role in related fields. At present, the methods for producing ultrashort pulse laser widely include Q-switching technology, mode-locking technology, and stimulated scattering technology. Q-switching technology can only generate laser pulses on the order of nanoseconds or sub-nanoseconds; It is on the order of micro-joules and has a complex structure; Stimulated Brillouin Scattering (SBS) pulse width compression technology can generate laser pulses of hundreds of picoseconds, but it is limited by nonlinear effects such as optical breakdown and cannot The theoretical compression limit is reached.
而受激拉曼散射(Stimulated Raman Scattering，SRS)一般都用于波长转换，由于SRS一般是单池聚焦，能量转化效率低且不可控，实验效果不理想，很少用来做脉宽压缩。本发明提出了一种基于受激拉曼散射二次放大结构的脉宽压缩器，该压缩器采用了二次放大结构，可以在具有超短脉冲激光输出的同时提高能量转化效率，由于拉曼活性介质具有声子寿命低的特点，有着更短的压缩极限，利用SRS脉宽压缩技术可以有效地获得皮秒级的超短脉冲激光,具有非常重要的实用价值和意义。Stimulated Raman Scattering (SRS) is generally used for wavelength conversion. Since SRS is generally single-cell focusing, the energy conversion efficiency is low and uncontrollable, and the experimental results are not ideal. It is rarely used for pulse width compression. The present invention proposes a pulse width compressor based on a secondary amplification structure of stimulated Raman scattering. The compressor adopts a secondary amplification structure, which can improve energy conversion efficiency while having an ultrashort pulse laser output. Due to the Raman The active medium has the characteristics of low phonon lifetime and a shorter compression limit. Using SRS pulse width compression technology can effectively obtain picosecond-level ultrashort pulse laser, which has very important practical value and significance.
发明内容Contents of the invention
本发明的目的是，提供了一种基于受激拉曼散射二次放大结构的脉宽压缩器，通过二次放大以实现高效率的拉曼压缩和放大，产生大能量超短脉冲激光，解决了传统SRS脉宽压缩结构的低能量转化效率问题。The purpose of the present invention is to provide a pulse width compressor based on the secondary amplification structure of stimulated Raman scattering, through secondary amplification to achieve high-efficiency Raman compression and amplification, to generate high-energy ultrashort pulse laser, to solve the problem of The problem of low energy conversion efficiency of the traditional SRS pulse width compression structure is solved.
为实现上述目的，本发明的技术方案是：For realizing the above object, technical scheme of the present invention is:
一种基于受激拉曼散射二次放大结构的脉宽压缩器，所述脉宽压缩器包括：泵浦源1、分束镜2、第一反射镜3、凸透镜4、SRS产生池5和SRS二次放大系统6。A pulse width compressor based on a stimulated Raman scattering secondary amplification structure, the pulse width compressor includes: a pump source 1, a beam splitter mirror 2, a first reflection mirror 3, a convex lens 4, an SRS generation pool 5 and SRS secondary amplification system6.
其中，所述SRS二次放大系统6包括第一二向色镜6-1、第一SRS放大池6-2、第二二向色镜6-3、第二反射镜6-4、第三反射镜6-5、第二SRS放大池6-6和第三二向色镜6-7；Wherein, the SRS secondary amplification system 6 includes a first dichroic mirror 6-1, a first SRS amplification pool 6-2, a second dichroic mirror 6-3, a second reflecting mirror 6-4, a third Mirror 6-5, second SRS amplification cell 6-6 and third dichroic mirror 6-7;
泵浦源1发出泵浦光，经分束镜2分为两束光，第一束光被凸透镜4和SRS二次放大系统6中的第一二向色镜6-1聚焦反射进入SRS产生池5发生背向SRS产生Stokes种子光，Stokes种子光原路返回透过第一二向色镜6-1进入第一SRS放大池6-2；第二束光被第一反射镜3和第二二向色镜6-3反射与Stokes种子光对向相遇进行第一次放大压缩；未耗尽的泵浦光被第一二向色镜6-1和第三二向色镜6-7反射进入第二SRS放大池6-6，第一次放大压缩后的Stokes种子光经第二二向色镜6-3透射、第二反射镜6-4和第三反射镜6-5反射进入第二SRS放大池6-6与未耗尽的泵浦光对向相遇并进行第二次放大压缩，二次放大压缩后的超短Stokes种子光透过第三二向色镜6-7输出。Pumping source 1 emits pump light, which is divided into two beams by beam splitter 2, and the first beam is focused and reflected by convex lens 4 and first dichroic mirror 6-1 in SRS secondary amplification system 6 and enters SRS to generate Pond 5 produces Stokes seed light back to SRS, and Stokes seed light returns through the first dichroic mirror 6-1 and enters the first SRS amplification pool 6-2; The second dichroic mirror 6-3 reflects and meets the Stokes seed light for the first amplification and compression; the unexhausted pump light is passed by the first dichroic mirror 6-1 and the third dichroic mirror 6-7 Reflected into the second SRS amplification pool 6-6, the Stokes seed light amplified and compressed for the first time is transmitted through the second dichroic mirror 6-3, reflected by the second reflector 6-4 and the third reflector 6-5 and enters The second SRS amplification pool 6-6 meets the unexhausted pump light oppositely and performs the second amplification and compression, and the ultra-short Stokes seed light after the second amplification and compression is output through the third dichroic mirror 6-7 .
所述第一二向色镜6-1、第二二向色镜6-3和第三二向色镜6-7均对Stokes种子光高透射，对泵浦光高反射。The first dichroic mirror 6-1, the second dichroic mirror 6-3 and the third dichroic mirror 6-7 all have high transmittance to the Stokes seed light and high reflection to the pump light.
其中，所述SRS产生池5、第一SRS放大池6-2和第二SRS放大池6-6的池中介质为Ba(NO3)2、CS2、H2、甲苯、液态氧和H2O等拉曼活性介质中的一种。Wherein, the media in the pools of the SRS generating pool 5, the first SRS amplification pool 6-2 and the second SRS amplification pool 6-6 are Ba(NO 3 ) 2 , CS 2 , H 2 , toluene, liquid oxygen and H One of the Raman active media such as 2 O.
本发明提供的技术方案的有益效果是：The beneficial effects of the technical solution provided by the invention are:
1、本发明提供的一种基于受激拉曼散射二次放大结构的脉宽压缩器，泵浦光经过基于受激拉曼散射二次放大结构的压缩放大，可以获得较高的能量输出，相比于锁模激光器，可直接产生数十毫焦的皮秒激光。利用了SRS脉宽压缩技术对泵浦光进行压缩，由于其拉曼活性介质具有声子寿命短的特点，可以产生短脉冲激光。1. A pulse width compressor based on a secondary amplification structure of stimulated Raman scattering provided by the present invention, the pump light can obtain higher energy output through compression and amplification based on a secondary amplification structure of stimulated Raman scattering, Compared with mode-locked lasers, picosecond lasers of tens of millijoules can be directly generated. The SRS pulse width compression technology is used to compress the pump light. Because the Raman active medium has the characteristics of short phonon lifetime, short pulse laser can be generated.
2、本发明提供的脉宽压缩器，由于SRS二次放大系统，泵浦光与Stokes光的相互作用时间增长，可以避免泵浦光能量的浪费，有效地增加能量转化效率，实现高效的脉宽压缩。2. The pulse width compressor provided by the present invention, due to the SRS secondary amplification system, the interaction time between the pump light and the Stokes light increases, which can avoid the waste of pump light energy, effectively increase the energy conversion efficiency, and realize efficient pulse width. wide compression.
3、本发明提供的脉宽压缩，SRS二次放大系统使泵浦光与Stokes光相向传输，增加第三反射镜6-5、第二SRS放大池6-6和第三二向色镜6-7，可以将剩余的泵浦光再次与Stokes种子光进行提取压缩，使得输入效率更高，拥有更高的能量转化效率，更加有利于种子光的放大和压缩。3. The pulse width compression provided by the present invention, the SRS secondary amplification system makes the pump light and the Stokes light transmit oppositely, adding the third reflector 6-5, the second SRS amplification pool 6-6 and the third dichroic mirror 6 -7, the remaining pump light can be extracted and compressed with the Stokes seed light again, so that the input efficiency is higher, the energy conversion efficiency is higher, and it is more conducive to the amplification and compression of the seed light.
4.本发明提供的脉宽压缩器，仅使用一种光源，通过分束镜分为两束，两束光只有能量不同，再通过采用三池结构(仅对一阶种子光进行放大，产生池为后向拉曼散射)，SRS产生池和SRS放大池中的拉曼活性介质具有较宽的增益带宽和较短的声子寿命，可以产生亚纳秒、皮秒甚至亚皮秒的脉冲激光，远低于调Q技术的压缩极限，解决了现有技术中由于受激拉曼散射受到高阶Stokes和前向以及后向散射的特点，而导致能量转化效率低，实验效果不理想的问题，实现了利用受激拉曼散射来作脉宽压缩的目的，能满足实验效果，脉冲宽度相比SBS脉宽压缩技术更窄，效率高且可以通过控制放大池的位置从而改变Stokes光与第二束光的相遇情况从而对输出的波形和脉宽发生改变，最佳情况为Stokes光与第二束光的泵浦光在第一放大池、第二放大池中心相遇，(效率高、压缩效果好，波形好、脉宽窄)，改变相遇位置可能会对一些需要产生特殊波形等情况有帮助(如控制前沿放大后沿不进行放大，产生特殊需要波形；改变两个放大池的长度相对单池，可以产生更长、更宽的波形等)，可以根据实际需要进行调整。本发明可以直接产生十几毫焦的皮秒激光，相对传统脉宽压缩转化效率(低于10％)可以提高到15％以上，而现有调Q激光效率最高为1％，因此，本申请效果显著。4. The pulse width compressor provided by the present invention only uses a kind of light source, and is divided into two beams by a beam splitter. The two beams of light have only different energy, and then adopt a three-cell structure (only the first-order seed light is amplified to generate a pool For backward Raman scattering), the Raman active medium in the SRS generation cell and the SRS amplification cell has a wide gain bandwidth and a short phonon lifetime, which can generate sub-nanosecond, picosecond or even sub-picosecond pulsed laser light , far lower than the compression limit of Q-switching technology, which solves the problem of low energy conversion efficiency and unsatisfactory experimental results in the prior art due to the characteristics of high-order Stokes and forward and backward scattering of stimulated Raman scattering , achieved the purpose of using stimulated Raman scattering for pulse width compression, which can meet the experimental results. Compared with the SBS pulse width compression technology, the pulse width is narrower, the efficiency is high, and the Stokes light and the first wave can be changed by controlling the position of the amplification cell. The encounter of the two beams of light changes the waveform and pulse width of the output. In the best case, the Stokes light and the pump light of the second beam of light meet at the center of the first amplification cell and the second amplification cell, (high efficiency, compression The effect is good, the waveform is good, and the pulse width is narrow), and changing the meeting position may be helpful for some situations that need to generate special waveforms (such as controlling the front edge to amplify and the back edge to not amplify to produce special waveforms; changing the length of the two amplification pools relative Single cell, can produce longer, wider waveform, etc.), can be adjusted according to actual needs. The present invention can directly generate a picosecond laser of more than a dozen millijoules, and the conversion efficiency (less than 10%) of the traditional pulse width compression can be increased to more than 15%, while the highest efficiency of the existing Q-switched laser is 1%. Therefore, the present application The effect is remarkable.
5.本发明提供的脉宽压缩器，由于基于受激拉曼散射效应，其波长频移较大(不同介质频移不同，或者改变输入波长改变输出波长)，在进行脉宽压缩的同时还可以产生其他激光器难以产生的特殊波长，输出为单纵模，即仅输出一个波长的脉冲。5. The pulse width compressor provided by the present invention, because it is based on the stimulated Raman scattering effect, its wavelength frequency shift is larger (different medium frequency shifts are different, or change the input wavelength to change the output wavelength), while performing pulse width compression, it can also It can produce special wavelengths that are difficult for other lasers to produce, and the output is a single longitudinal mode, that is, only a pulse of one wavelength is output.
附图说明Description of drawings
图1为一种基于受激拉曼散射二次放大结构的脉宽压缩器的结构示意图。FIG. 1 is a schematic structural diagram of a pulse width compressor based on a secondary amplification structure of stimulated Raman scattering.
图2为本发明实施例一的输出脉宽结果图。FIG. 2 is a graph showing the result of the output pulse width in Embodiment 1 of the present invention.
图3为本发明不同泵浦源脉冲宽度下的输出脉宽的数值结果模拟图。Fig. 3 is a simulation diagram of the numerical results of the output pulse width under different pump source pulse widths in the present invention.
图4为本发明实施例三的输出脉宽结果图。FIG. 4 is a graph showing the result of the output pulse width in Embodiment 3 of the present invention.
附图中，各标号所代表的部件列表如下：In the accompanying drawings, the list of parts represented by each label is as follows:
1：泵浦源； 2：分束镜；1: pump source; 2: beam splitter;
3：第一反射镜； 4：凸透镜；3: first reflector; 4: convex lens;
5；SRS产生池； 6：SRS二次放大系统；5; SRS generation pool; 6: SRS secondary amplification system;
6-1：第一二向色镜； 6-2：第一SRS放大池；6-1: the first dichroic mirror; 6-2: the first SRS amplification cell;
6-3：第二二向色镜； 6-4：第二反射镜；6-3: second dichroic mirror; 6-4: second reflector;
6-5：第三反射镜； 6-6：第二SRS放大池：6-5: The third reflector; 6-6: The second SRS magnifying pool:
6-7：第三二向色镜。6-7: Third dichroic mirror.
具体实施方式Detailed ways
下面结合实施例及附图进一步解释本发明，但并不以此作为对本申请保护范围的限定。The present invention will be further explained below in conjunction with the embodiments and accompanying drawings, but this should not be used as a limitation to the protection scope of the present application.
本发明提出了一种基于受激拉曼散射二次放大结构的脉宽压缩器，使第一次放大后未耗尽的泵浦光与Stokes种子光进行两次相遇放大以提高能量转化率，实现更加高效的脉宽压缩。The present invention proposes a pulse width compressor based on a secondary amplification structure of stimulated Raman scattering, so that the unexhausted pump light and the Stokes seed light are amplified twice to improve the energy conversion rate after the first amplification. Enables more efficient pulse width compression.
参见图1，一种基于受激拉曼散射二次放大结构的脉宽压缩器包括：泵浦源1、分束镜2、第一反射镜3、凸透镜4、SRS产生池5和SRS二次放大系统6。Referring to Figure 1, a pulse width compressor based on a secondary amplification structure of stimulated Raman scattering includes: a pump source 1, a beam splitter mirror 2, a first mirror 3, a convex lens 4, an SRS generating pool 5 and an SRS secondary Zoom system6.
其中，所述SRS二次放大系统6由第一二向色镜6-1、第一SRS放大池6-2、第二二向色镜6-3、第二反射镜6-4、第三反射镜6-5、第二SRS放大池6-6和第三二向色镜6-7组成。Wherein, the SRS secondary amplification system 6 is composed of a first dichroic mirror 6-1, a first SRS amplification pool 6-2, a second dichroic mirror 6-3, a second reflecting mirror 6-4, a third The reflector 6-5, the second SRS amplification pool 6-6 and the third dichroic mirror 6-7 are composed.
进一步地，泵浦源1发出泵浦光，经分束镜2分为两束，第一束光被凸透镜4和SRS二次放大系统6中的第一二向色镜6-1聚焦反射进入SRS产生池5发生背向SRS产生Stokes种子光，Stokes种子光原路返回透过第一二向色镜6-1进入第一SRS放大池6-2；第二束光被第一反射镜3和第二二向色镜6-3反射与Stokes种子光对向相遇进行第一次放大压缩；未耗尽的泵浦光被第一二向色镜6-1和第三二向色镜6-7反射进入第二SRS放大池6-6，第一次放大压缩后的Stokes种子光经第二二向色镜6-3透射、第二反射镜6-4和第三反射镜6-5反射进入第二SRS放大池6-6与未耗尽的泵浦光对向相遇并进行第二次放大压缩，二次放大压缩后的超短Stokes种子光透过第三二向色镜6-7输出。Further, the pumping source 1 emits pumping light, which is divided into two beams by the beam splitter 2, and the first beam is focused and reflected by the convex lens 4 and the first dichroic mirror 6-1 in the SRS secondary amplification system 6 to enter The SRS generating pool 5 generates Stokes seed light facing away from the SRS, and the Stokes seed light returns through the original path through the first dichroic mirror 6-1 and enters the first SRS amplification pool 6-2; Reflecting with the second dichroic mirror 6-3 and encountering the Stokes seed light for the first time amplification and compression; the unexhausted pump light is absorbed by the first dichroic mirror 6-1 and the third dichroic mirror 6 -7 reflection enters the second SRS amplification pool 6-6, the Stokes seed light after the first amplification and compression is transmitted through the second dichroic mirror 6-3, the second reflection mirror 6-4 and the third reflection mirror 6-5 The reflection enters the second SRS amplification pool 6-6 to meet the unexhausted pump light in opposite directions and undergoes a second amplification and compression, and the ultra-short Stokes seed light after the second amplification and compression passes through the third dichroic mirror 6- 7 outputs.
二向色镜特点为：对某一波长有反射效果，对另一波长有透射效果，第一二向色镜6-1对聚焦后的泵浦光高反，使其进入SRS产生池5发生背向拉曼散射产生种子光，第一二向色镜6-1对种子光高透，使其能直接进入第一SRS放大池6-2，与泵浦源1对向相遇，对向相遇后从第一SRS放大池6-2出来的泵浦源还未耗尽，经第一二向色镜6-1高反后作用在第三二向色镜上，进而在第三二向色镜上将未耗尽的泵浦光高反进入第二SRS放大池6-6，种子光经过第一次放大压缩后经过第二二向色镜对其高透经第二反射镜和第三反射镜而进入第二SRS放大池6-6，在第二SRS放大池6-6内种子光与未耗尽的泵浦光对向相遇，种子光再次压缩后经第三二向色镜6-7高透输出。The characteristics of the dichroic mirror are: it has a reflection effect on a certain wavelength and a transmission effect on another wavelength. The first dichroic mirror 6-1 is highly reflective to the focused pump light, so that it enters the SRS generating pool 5 to generate The seed light is generated by back Raman scattering, and the first dichroic mirror 6-1 is highly transparent to the seed light, so that it can directly enter the first SRS amplification cell 6-2, and meet the pump source 1 in opposite directions. Finally, the pump source from the first SRS amplification pool 6-2 has not been exhausted, and acts on the third dichroic mirror after being highly reflected by the first dichroic mirror 6-1, and then in the third dichroic mirror On the mirror, the unexhausted pump light is highly reflected into the second SRS amplification pool 6-6. After the first amplification and compression, the seed light passes through the second dichroic mirror and passes through the second reflection mirror and the third reflection mirror. The reflector enters the second SRS amplification pool 6-6, and the seed light meets the unexhausted pump light in the second SRS amplification pool 6-6, and the seed light passes through the third dichroic mirror 6 after being compressed again -7 high transparency output.
SRS产生池5是产生了Stokes种子光，该光能量低且脉宽较宽，Stokes种子光会进入SRS二次放大系统6，在两个放大池被泵浦光放大，即与分束后的另一部分光对向相遇并且进行能量的提取以及脉宽的压缩。The SRS generating pool 5 produces the Stokes seed light, which has low energy and wide pulse width, and the Stokes seed light will enter the SRS secondary amplification system 6, and be amplified by the pump light in the two amplification pools, which is the same as the split beam. The other part of the light meets and extracts energy and compresses the pulse width.
在拉曼产生过程中会有高阶Stokes产生，本发明将一阶Stokes光放大，高阶Stokes不会透过第一二向色镜6-1进入第一SRS放大池6-2，可以有效地防止高阶Stokes对放大压缩造成影响，背向拉曼产生的Stokes光与泵浦光方向相反，如本发明在SRS产生池5中为背向拉曼Stokes光后向传输，与泵浦光传输方向相反。在SRS产生池5中Stokes光会先与泵浦光对向相遇进行一次压缩，体现出预压缩效果，同时经第一二向色镜6-1后的反向Stokes种子光再与第二束光对向相遇，进行二次压缩并提取第二束光的能量进行放大，未耗尽的泵浦光再经第二SRS放大池6-6将种子光再次进行放大压缩，实现了三次压缩效果，压缩效率更高。因此，本发明的SRS脉宽压缩具有更宽的增益带宽和更短的压缩极限，更有可能实现皮秒脉冲的获取。High-order Stokes will be generated during the Raman generation process. The present invention amplifies the first-order Stokes light, and the high-order Stokes will not enter the first SRS amplification pool 6-2 through the first dichroic mirror 6-1, which can effectively To prevent high-order Stokes from affecting the amplification and compression, the Stokes light generated by back-to-Raman is opposite to the direction of the pump light. For example, in the SRS generation pool 5 in the present invention, the back-to-Raman Stokes light is transmitted backward, and the direction of the pump light is opposite to that of the pump light. The direction of transmission is reversed. In the SRS generation pool 5, the Stokes light will first meet the pumping light in opposite directions to compress once, reflecting the pre-compression effect, and at the same time, the reverse Stokes seed light after the first dichroic mirror 6-1 is combined with the second beam When the light meets opposite directions, it performs secondary compression and extracts the energy of the second beam of light for amplification. The unexhausted pump light passes through the second SRS amplification pool 6-6 to amplify and compress the seed light again, achieving the third compression effect , the compression efficiency is higher. Therefore, the SRS pulse width compression of the present invention has a wider gain bandwidth and a shorter compression limit, and is more likely to realize the acquisition of picosecond pulses.
其中，所述凸透镜4焦点在SRS产生池5中心。Wherein, the focal point of the convex lens 4 is at the center of the SRS generating pool 5 .
进一步地，所述第一二向色镜6-1、第二二向色镜6-3和第三二向色镜6-7均对一阶Stokes种子光高透射，对泵浦光高反射。第一二向色镜与第二二向色镜平行等高度设置，二者均倾斜45°放置，第三二向色镜6-7位于第一二向色镜6-1的下方，二者之间的夹角为90°。Further, the first dichroic mirror 6-1, the second dichroic mirror 6-3 and the third dichroic mirror 6-7 are all highly transmissive to the first-order Stokes seed light and highly reflective to the pump light . The first dichroic mirror and the second dichroic mirror are arranged at the same height parallel to each other, both of which are placed at an angle of 45°, and the third dichroic mirror 6-7 is located below the first dichroic mirror 6-1. The angle between them is 90°.
SRS产生池5、第一SRS放大池6-2和第二SRS放大池6-6均为拉曼活性介质，如Ba(NO3)2、CS2、H2、甲苯、液态氧和H2O等固体、气体以及液体拉曼活性介质，光学声子寿命在皮秒量级。泵浦源1选择的单纵模激光器在波长在200nm～1500nm之间，凸透镜4的焦距范围为10cm～70cm，SRS产生池5池长为0.5cm～120cm，两个SRS放大池池长为0.5cm～150cm。The SRS generation cell 5, the first SRS amplification cell 6-2 and the second SRS amplification cell 6-6 are all Raman active media, such as Ba(NO 3 ) 2 , CS 2 , H 2 , toluene, liquid oxygen and H 2 O and other solid, gas and liquid Raman active media have optical phonon lifetimes on the order of picoseconds. The wavelength of the single longitudinal mode laser selected by the pump source 1 is between 200nm and 1500nm, the focal length range of the convex lens 4 is 10cm to 70cm, the length of the SRS generation pool 5 is 0.5cm to 120cm, and the length of the two SRS amplification pools is 0.5 cm ~ 150cm.
此外，本申请在第一二向色镜6-1与SRS产生池5之间加入了测量系统；测量系统由楔形板、第一能量计、第一光电探测器、第二能量计和第二光电探测器组成；测量系统可以测量泵浦光和经SRS产生池5产生的Stokes种子光的能量和时域波形；楔形板为两个面呈一定夹角的光学板，光透过该楔形板时会被反射出两束能量均为入射光能量4％的反射光；泵浦光被楔形板反射进入第一能量计和第一光电探测器；Stokes种子光在通过楔形板时被反射进入第二能量计和第二光电探测器。In addition, the present application adds a measurement system between the first dichroic mirror 6-1 and the SRS generation pool 5; the measurement system consists of a wedge plate, a first energy meter, a first photodetector, a second energy meter and a second Composed of photodetectors; the measurement system can measure the energy and time-domain waveforms of the pump light and the Stokes seed light generated by the SRS generation cell 5; the wedge-shaped plate is an optical plate with a certain angle between the two surfaces, and the light passes through the wedge-shaped plate Two beams of reflected light whose energy is 4% of the energy of the incident light will be reflected; the pump light is reflected by the wedge plate into the first energy meter and the first photodetector; the Stokes seed light is reflected into the first energy meter and the first photodetector when passing through the wedge plate. Two energy meters and a second photodetector.
分束镜2的分束情况可根据下述方法选取：分束镜2为45°角放置，通过更换不同分束镜2将光束分为能量比值不同的两束光，使SRS产生池5产生的Stokes光与第二束光的峰值功率相当；此时最终输出的Stokes种子光具有相对较高的能量转化效率。峰值功率由相应的能量计和光电探测器获得。The beam splitting of the beam splitter 2 can be selected according to the following method: the beam splitter 2 is placed at an angle of 45°, and the light beam is divided into two beams of light with different energy ratios by replacing the different beam splitter 2, so that the SRS generation pool 5 generates The peak power of the Stokes light is equivalent to that of the second light beam; at this time, the final output Stokes seed light has a relatively high energy conversion efficiency. The peak power is obtained by the corresponding energy meter and photodetector.
泵浦源1选择的单纵模激光器波长在200nm～1500nm之间，脉宽为0.1ns～10ns，SRS产生池5焦点入射处到焦点处的光路f'为脉宽对应光长的一半，可表示为：其中c为真空中的光速，τp为泵浦源1的脉宽，n为SRS产生池5池中介质折射率。焦点为凸透镜4在SRS产生池5形成的焦点，焦点入射处指的是SRS产生池5的右边界，光从SRS产生池5右边界入射进入SRS产生池5的内部。The wavelength of the single longitudinal mode laser selected by the pump source 1 is between 200nm and 1500nm, and the pulse width is 0.1ns to 10ns. Expressed as: Where c is the speed of light in vacuum, τ p is the pulse width of the pump source 1, and n is the refractive index of the medium in the SRS generating pool 5. The focal point is the focal point formed by the convex lens 4 in the SRS generation pool 5, and the focal point of incidence refers to the right boundary of the SRS generation pool 5, and the light enters the inside of the SRS generation pool 5 from the right boundary of the SRS generation pool 5.
凸透镜4的焦距f＝d+f'，d为凸透镜4中心点到SRS产生池焦点入射处的距离，即池镜间距。The focal length of the convex lens 4 is f=d+f', where d is the distance from the central point of the convex lens 4 to the incident point of the focal point of the pool where the SRS is generated, that is, the distance between the pool mirrors.
为了保证凸透镜4焦点在池内，SRS产生池5与两个SRS放大池池长均需要满足：L>f'。In order to ensure that the focal point of the convex lens 4 is in the pool, the pool lengths of the SRS generation pool 5 and the two SRS amplification pools need to satisfy: L>f'.
设η为能量转化效率，可以表示为：Ep为泵浦光能量即泵浦源1的输出，Es为第二二向色镜8最终输出的Stokes光能量。Let η be the energy conversion efficiency, which can be expressed as: E p is the energy of the pump light, that is, the output of the pump source 1 , and E s is the energy of the Stokes light finally output by the second dichroic mirror 8 .
焦点为凸透镜4在SRS产生池5形成的焦点，焦点入射处指的是SRS产生池5的右边界，光从SRS产生池5右边界入射进入SRS产生池5的内部。The focal point is the focal point formed by the convex lens 4 in the SRS generation pool 5, and the focal point of incidence refers to the right boundary of the SRS generation pool 5, and the light enters the inside of the SRS generation pool 5 from the right boundary of the SRS generation pool 5.
实施例一：本实施例与上述具体实施方式结构相同，并且具有以下参数：Embodiment 1: This embodiment has the same structure as the above-mentioned specific embodiment, and has the following parameters:
泵浦源1输出的波长为1064nm，脉冲宽度为1ns，发散角为0.45mrad，峰值功率为1.5MW，脉宽为1ns；SRS产生池5、第一SRS放大池6-2和第二SRS放大池6-6的池中介质均为Ba(NO3)2晶体(1064nm拉曼增益系数为11cm/GW，声子寿命为80ps)，SRS产生池5、第一SRS放大池6-2和第二SRS放大池6-6的池长均为100mm；凸透镜4距SRS产生池5的距离为25cm，凸透镜4的焦距为31cm，其他器件型号不做限制。考虑损耗以及高阶Stokes的影响，实际的能量转化效率大概在20％左右，在同一条件下，加入第二SRS放大池最终输出能量将高于仅设置一个SRS放大池的情况。The output wavelength of the pump source 1 is 1064nm, the pulse width is 1ns, the divergence angle is 0.45mrad, the peak power is 1.5MW, and the pulse width is 1ns; the SRS generation pool 5, the first SRS amplification pool 6-2 and the second SRS amplification The medium in pool 6-6 is Ba(NO 3 ) 2 crystal (1064nm Raman gain coefficient is 11cm/GW, phonon lifetime is 80ps), SRS generation pool 5, the first SRS amplification pool 6-2 and the second The pool length of the two SRS magnifying pools 6-6 is 100mm; the distance between the convex lens 4 and the SRS generating pool 5 is 25cm, the focal length of the convex lens 4 is 31cm, and other device types are not limited. Considering the impact of loss and high-order Stokes, the actual energy conversion efficiency is about 20%. Under the same conditions, the final output energy of adding a second SRS amplification pool will be higher than that of only one SRS amplification pool.
从图2中可以看出输出脉宽为65.5ps，相比于输入光的1ns脉宽，有了明显的压缩。It can be seen from Figure 2 that the output pulse width is 65.5 ps, which is significantly compressed compared to the 1 ns pulse width of the input light.
实施例二：本实施例中改变泵浦源1脉冲宽度，其余参数与实施例一参数相同，数值结果模拟如图3所示。不同的泵浦源脉宽对输出光脉宽和波形的影响。Embodiment 2: In this embodiment, the pulse width of the pump source 1 is changed, and other parameters are the same as those in Embodiment 1. The numerical simulation results are shown in FIG. 3 . The influence of different pump source pulse widths on the output light pulse width and waveform.
实施例三：本实施例中泵浦源1的输出波长为532nm，峰值功率为20MW，脉冲宽度为700ps，发散角为0.45mrad，采用去离子水(532nm拉曼增益系数为0.1cm/GW，声子寿命为1.9ps)作为拉曼介质，SRS产生池5、第一SRS放大池6-2和第二SRS放大池6-6的池长均为100mm，凸透镜4距SRS产生池5的距离为10cm，凸透镜4的焦距为14cm，其他参数与器件型号与实施例一相同，本实施例的数值模拟结果如图4所示。Embodiment three: in the present embodiment, the output wavelength of the pump source 1 is 532nm, the peak power is 20MW, the pulse width is 700ps, and the divergence angle is 0.45mrad. Deionized water (532nm Raman gain coefficient is 0.1cm/GW, Phonon lifetime is 1.9ps) as Raman medium, the pool length of SRS generation pool 5, the first SRS amplification pool 6-2 and the second SRS amplification pool 6-6 is 100mm, and the distance between convex lens 4 and SRS generation pool 5 is 10cm, the focal length of the convex lens 4 is 14cm, and other parameters and device models are the same as in Embodiment 1. The numerical simulation results of this embodiment are shown in Figure 4.
对比实施例一和实施例三，拉曼活性介质从Ba(NO3)2换成了去离子水，最终输出了93.8ps的激光输出。Comparing Example 1 and Example 3, the Raman active medium was changed from Ba(NO 3 ) 2 to deionized water, and finally a laser output of 93.8 ps was output.
本发明中通过控制SRS放大池的位置，能调节对向相遇时间，提高效率，由分束镜分束进入SRS产生池5中的光较少，几乎10％左右进入，走向反射镜3的第二束光的泵浦光能量较大，经过第一二向色镜的反向Stokes种子光再与第二束光对向相遇时，能够提取的能量较大，让前沿上升的更快；经过产生放大结构(SRS产生池5和SRS放大池)能使得输入纳秒级，输出达到压皮秒、几皮秒、几十皮秒量级的压缩效果，输入的脉宽不同池长也相应的调整。In the present invention, by controlling the position of the SRS magnifying pool, the opposite meeting time can be adjusted, and the efficiency can be improved. The light entering the SRS generating pool 5 by beam splitting is less, about 10% enters, and goes to the first part of the reflecting mirror 3. The energy of the pumping light of the second beam of light is relatively large, and when the reverse Stokes seed light passing through the first dichroic mirror meets the second beam of light, the energy that can be extracted is relatively large, making the leading edge rise faster; The generation amplification structure (SRS generation pool 5 and SRS amplification pool) can make the input at the level of nanoseconds, and the output can achieve the compression effect of picoseconds, several picoseconds, and tens of picoseconds. The input pulse width is different and the pool length is corresponding Adjustment.
以上所述实施例仅为本发明的较佳实施例，并不会限制本发明的保护范围，凡在本发明的精神和原则内，所作出的修改、等同替换等，均在本发明的保护范围内。The above-described embodiments are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention. All modifications, equivalent replacements, etc. made within the spirit and principles of the present invention are all within the protection of the present invention. within range.
本发明未述及之处适用于现有技术。What is not mentioned in the present invention is applicable to the prior art.
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| CN105024274A (en) * | 2014-04-24 | 2015-11-04 | 中国科学院大连化学物理研究所 | Raman laser device for optimizing pumping laser by means of two-stage stimulated Brillouin scattering method |
| CN110021873B (en) * | 2019-05-28 | 2023-10-13 | 长春理工大学 | Laser based on cascade stimulated scattering |
| CN112038874B (en) * | 2020-08-03 | 2024-05-28 | 河北工业大学 | Self-pumping SBS pulse compression system of double pools |
| CN213304579U (en) * | 2020-11-05 | 2021-05-28 | 河北工业大学 | Multi-wavelength output short pulse laser |
| CN214379228U (en) * | 2021-04-12 | 2021-10-08 | 河北工业大学 | Device capable of inhibiting tail modulation and obtaining picosecond pulse compression |
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2022
- 2022-01-13 CN CN202210034661.0A patent/CN114389138B/en active Active
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