CN104716560B - It is a kind of based on hollow glass tube and to carry the gas excited Raman amplifier of seed light - Google Patents
It is a kind of based on hollow glass tube and to carry the gas excited Raman amplifier of seed light Download PDFInfo
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Abstract
本发明提供了一种基于空心玻璃管且自带拉曼种子光的气体受激拉曼放大器，包括一台泵浦激光器、一套分光系统、第一个拉曼池、第二个拉曼池、一根空心玻璃管和一组分光棱镜。泵浦光源通过分光系统分成两束泵浦光，其中第一束泵浦光通过第一二相色镜导入第一个拉曼池产生后向拉曼种子光；第二束泵浦光通过光路延迟，与后向拉曼种子光同时到达第二二相色镜并进行合束，然后一起以掠入射方式导入置于第二个拉曼池内的空心玻璃管内进行受激拉曼放大。最后通过分光棱镜组分光得到单一放大拉曼光。实验结果表明，和传统的双级联拉曼池相比，本发明可以获得转换效率更高的受激放大拉曼光。本发明可以广泛应用于军事、医疗、环境监测等领域。
The invention provides a gas-stimulated Raman amplifier based on a hollow glass tube with Raman seed light, including a pump laser, a spectroscopic system, a first Raman cell, and a second Raman cell , a hollow glass tube and a group of optical prisms. The pumping light source is divided into two beams of pumping light through the beam splitting system, wherein the first beam of pumping light is introduced into the first Raman cell through the first dichroic mirror to generate backward Raman seed light; the second beam of pumping light passes through the optical path The delayed Raman seed light and the backward Raman seed light arrive at the second dichroic mirror at the same time and are combined, and then they are introduced into the hollow glass tube placed in the second Raman cell in the form of grazing incidence together for stimulated Raman amplification. Finally, a single amplified Raman light is obtained by combining the light through a spectroscopic prism. Experimental results show that, compared with the traditional double cascaded Raman cell, the invention can obtain stimulated amplified Raman light with higher conversion efficiency. The invention can be widely used in the fields of military affairs, medical treatment, environment monitoring and the like.
Description
技术领域technical field
本发明涉及受激拉曼放大器，特别是一种基于空心玻璃管且自带拉曼种子光的气体受激拉曼放大器。The invention relates to a stimulated Raman amplifier, in particular to a gas stimulated Raman amplifier based on a hollow glass tube with Raman seed light.
背景技术Background technique
近年来，随着激光在交通、测量、医疗、国防和工农业等众多应用领域不断地发展，开发特殊的激光波长已经越来越引起人们的注意。这些特殊的激光波长可以通过新的激光工作物质产生，也可以通过气体或光学材料（如晶体等）的非线性光学频率转换产生。在非线性光学领域，受激拉曼散射能够用来对激光发射波长做特定频率转换（取决于拉曼介质的拉曼振/转动模频率），达到特定的激光波长输出。因此，受激拉曼散射技术是实现激光波长变换的重要技术手段。In recent years, with the continuous development of lasers in many application fields such as transportation, measurement, medical treatment, national defense and industry and agriculture, the development of special laser wavelengths has attracted more and more attention. These special laser wavelengths can be generated by new laser working substances, or by nonlinear optical frequency conversion of gases or optical materials (such as crystals, etc.). In the field of nonlinear optics, stimulated Raman scattering can be used to convert the laser emission wavelength to a specific frequency (depending on the Raman vibration/rotational mode frequency of the Raman medium) to achieve a specific laser wavelength output. Therefore, stimulated Raman scattering technology is an important technical means to realize laser wavelength conversion.
依据拉曼介质的物质形态不同，拉曼介质可分为固体、液体和气体。固体拉曼介质一般体积小，拉曼介质浓度高，故其拉曼增益和转化率高。当前已研制出多种固体拉曼介质，应用十分广泛，但固体拉曼介质损伤阈值低，不易实现高能量激光输出。液体拉曼介质则由于液体介质的挥发性，毒性或不稳定性等缺陷，应用范围受到很大限制。相对而言，气体拉曼介质浓度较低，增益较小，但具有较好的热管理性、较高的损伤阈值（更可能实现大能量拉曼激光输出）、高拉曼振动模（大拉曼频移）和窄拉曼线宽等优点，因此也得到了广泛深入的研究。常用的气体拉曼介质有H2，CH4，O2和N2等。According to the different material forms of Raman media, Raman media can be divided into solid, liquid and gas. The solid Raman medium is generally small in volume and high in Raman medium concentration, so its Raman gain and conversion rate are high. At present, a variety of solid Raman media have been developed, which are widely used, but the damage threshold of solid Raman media is low, and it is difficult to achieve high-energy laser output. The liquid Raman medium has a limited application range due to the volatility, toxicity or instability of the liquid medium. Relatively speaking, the gas Raman medium has a lower concentration and a smaller gain, but it has better thermal management, higher damage threshold (more likely to achieve high-energy Raman laser output), high Raman vibration mode (large Raman Man frequency shift) and narrow Raman linewidth and other advantages, so it has also been extensively and deeply studied. Common gaseous Raman media include H 2 , CH 4 , O 2 and N 2 .
目前，采用气体介质实现激光受激拉曼转换的经典方法主要是：泵浦激光器输出的泵浦光经过透镜聚焦，导入充满气体拉曼介质的单程拉曼池内发生受激拉曼散射过程，产生斯托克斯拉曼光，然后再通过准直透镜、棱镜分光得到拉曼放大光。在此过程中，只有在聚焦透镜的焦点位置附近的一小段区域内激光功率密度可以达到受激拉曼散射阈值；也就是说，只有在此区域内才可以发生受激拉曼散射实现对泵浦光的频率转换。因此泵浦光与拉曼介质的有效相互作用区域很小，难以获得较高的拉曼转化效率。At present, the classic method of using gas medium to realize laser stimulated Raman conversion is mainly: the pump light output by the pump laser is focused by a lens, and then introduced into a one-way Raman cell filled with gas Raman medium to undergo stimulated Raman scattering process, resulting in The Stokes Raman light is then split through a collimating lens and a prism to obtain Raman amplified light. In this process, the laser power density can reach the stimulated Raman scattering threshold only in a small area near the focal position of the focusing lens; that is, only in this area can stimulated Raman scattering occur to realize the pumping Frequency conversion of Puguang. Therefore, the effective interaction area between the pump light and the Raman medium is very small, and it is difficult to obtain a high Raman conversion efficiency.
此外，通常说的受激拉曼阈值是指拉曼振荡池中通过受激拉曼散射来实现从自发拉曼散射产生的噪声放大到可观测程度时所需要的最小泵浦光强。经典的单程拉曼池的激光波长转换，是自发拉曼散射为后续的受激拉曼散射提供了种子光。另外，由于气体介质的粒子浓度小，这就意味着传统的气体增益系数比较小，受激拉曼散射阈值会比较高。为此，人们提出了一种自带拉曼种子光的拉曼放大器，则自发拉曼散射的作用可以忽略不计，其受激拉曼散射过程实际上就不需要阈值。这样一来，解决了气体受激拉曼散射阈值较高的技术难题，泵浦光和拉曼种子光的有效相互作用区域也所有增大，但远离焦点处的泵浦光功率密度下降很快，很难继续进行受激拉曼放大过程，即有效相互作用区域仍然有所限制，因此还是难以获得较高的拉曼转化效率。In addition, generally speaking, the stimulated Raman threshold refers to the minimum pump light intensity required to amplify the noise generated by spontaneous Raman scattering to an observable level through stimulated Raman scattering in the Raman oscillation cell. In the laser wavelength conversion of the classic one-way Raman cell, the spontaneous Raman scattering provides the seed light for the subsequent stimulated Raman scattering. In addition, due to the small particle concentration of the gas medium, this means that the traditional gas gain coefficient is relatively small, and the stimulated Raman scattering threshold will be relatively high. For this reason, people proposed a Raman amplifier with its own Raman seed light, the effect of spontaneous Raman scattering can be ignored, and the stimulated Raman scattering process does not actually need a threshold. In this way, the technical problem of high gas stimulated Raman scattering threshold is solved, and the effective interaction area between the pump light and the Raman seed light is also enlarged, but the pump light power density far away from the focal point drops rapidly , it is difficult to continue the stimulated Raman amplification process, that is, the effective interaction area is still limited, so it is still difficult to obtain a high Raman conversion efficiency.
发明内容Contents of the invention
本发明为解决上述背景技术中存在的技术问题，提供了一种基于空心玻璃管且自带拉曼种子光的气体受激拉曼放大器，能够明显增加泵浦光和拉曼种子光的有效相互作用长度，并且提高泵浦光的功率密度，显著提高拉曼光转化效率。In order to solve the technical problems in the above-mentioned background technology, the present invention provides a gas-stimulated Raman amplifier based on a hollow glass tube with Raman seed light, which can significantly increase the effective interaction between the pump light and the Raman seed light. The length of action, and the power density of the pump light is increased, which significantly improves the Raman light conversion efficiency.
本发明的技术解决方案如下：Technical solution of the present invention is as follows:
一种基于空心玻璃管且自带种子光的气体受激拉曼放大器，包括一台泵浦激光器，一套分光系统，第一个拉曼池，第二个拉曼池，一根空心玻璃管和一组分光棱镜，其特征在于：泵浦激光器输出的泵浦光通过分光系统分成两束泵浦光；第一束泵浦光通过第一个拉曼池产生后向斯托克斯光作为拉曼种子光，后向斯托克斯光作为拉曼种子光和第二束泵浦光同时以掠入射方式导入置于第二个拉曼池内的空心玻璃管内进行拉曼光受激放大。A gas-stimulated Raman amplifier based on a hollow glass tube with its own seed light, including a pump laser, a spectroscopic system, the first Raman cell, the second Raman cell, and a hollow glass tube and a group of optical prisms, characterized in that: the pump light output by the pump laser is divided into two beams of pump light by a splitting system; the first beam of pump light passes through the first Raman cell to generate backward Stokes light as The Raman seed light and the backward Stokes light are used as the Raman seed light and the second beam of pump light to be introduced into the hollow glass tube placed in the second Raman cell in the form of grazing incidence at the same time for the Raman light to be stimulated and amplified.
其中，第一束泵浦光通过第一二相色镜反射和第一聚焦透镜聚焦导入第一个拉曼池，随之产生后向斯托克斯拉曼种子光，该拉曼种子光按原光路返回、依次穿过第一聚焦透镜、第一二相色镜、第二聚焦透镜和第二二相色镜进入第二个拉曼池内置的空心玻璃管内，作为拉曼种子光；第二束泵浦光先后通过第一高反镜、第三聚焦透镜和第二高反镜进行光路延迟，作为受激拉曼放大泵浦光，与后向斯托克斯拉曼种子光同时到达第二二相色镜，然后经第二二相色镜反射与后向斯托克斯拉曼种子光在空间上达到重合，后一起以掠入射方式导入置于第二个拉曼池内的空心玻璃管进行受激拉曼放大；最后，空心玻璃管输出端口的输出光先后通过准直透镜和分光棱镜组，把剩余的泵浦光P和放大拉曼光S1分开，从而得到单一的放大拉曼光。Among them, the first beam of pump light is reflected by the first dichroic mirror and focused by the first focusing lens into the first Raman cell, and then generates backward Stokes Raman seed light, and the Raman seed light is pressed by The original light path returns, passes through the first focusing lens, the first dichroic mirror, the second focusing lens and the second dichroic mirror in turn, and enters the hollow glass tube built into the second Raman cell as the Raman seed light; The two beams of pump light pass through the first high-reflection mirror, the third focusing lens and the second high-reflection mirror successively for optical path delay, as stimulated Raman amplified pump light, and arrive at the same time as the backward Stokes Raman seed light The second dichroic mirror, then the reflection of the second dichroic mirror and the backward Stokes Raman seed light coincide in space, and then they are introduced into the hollow center placed in the second Raman cell in the way of grazing incidence. The glass tube performs stimulated Raman amplification; finally, the output light from the output port of the hollow glass tube passes through the collimator lens and the beam splitting prism group successively to separate the remaining pump light P from the amplified Raman light S1, thereby obtaining a single amplified Raman light Man Guang.
其中，所述的拉曼种子光和第二束泵浦光分别通过第二聚焦透镜和第三聚焦透镜在空间上均聚焦到置于第二个拉曼池内的空心玻璃管的输入端口。Wherein, the Raman seed light and the second beam of pump light are spatially focused to the input port of the hollow glass tube placed in the second Raman cell through the second focusing lens and the third focusing lens respectively.
其中，所述的拉曼种子光和第二束泵浦光分别通过各自光路在时间上同时到达第二二相色镜上并进行合束。Wherein, the Raman seed light and the second pump light pass through their respective optical paths and arrive at the second dichroic mirror at the same time in time and combine them.
其中，所述的拉曼种子光为第一束泵浦光在第一个拉曼池内产生的后向斯托克斯受激拉曼光，其光束质量优于泵浦光。Wherein, the Raman seed light is the backward Stokes stimulated Raman light generated by the first pump light in the first Raman cell, and its beam quality is better than that of the pump light.
其中，所述的第一个拉曼池左侧为入射窗口，右侧为出射窗口，两窗口分别设为第一石英窗口片和第二石英窗口片，经第一聚焦透镜后的第一束泵浦光先通过第一个拉曼池入射窗口再通过出射窗口透射出去，产生的后向斯托克斯拉曼种子光按原光路经入射端第一窗口片返回。Wherein, the left side of the first Raman cell is the incident window, and the right side is the exit window, and the two windows are respectively set as the first quartz window and the second quartz window, and the first beam after passing through the first focusing lens The pump light first passes through the incident window of the first Raman cell and then transmits through the exit window, and the generated backward Stokes Raman seed light returns through the first window plate at the incident end according to the original optical path.
其中，所述的第二个拉曼池右侧为入射窗口，左侧为出射窗口，两窗口分别设为第三石英窗口片和第四石英窗口片，拉曼种子光和第二束泵浦光在第二二相色镜上合束后的混合光先通过第二个拉曼池入射窗口，一起以掠入射方式导入置于第二个拉曼池内的空心玻璃管发生受激拉曼放大过程，然后剩余的泵浦光P和放大拉曼光S1均通过出射窗口透射出去。Wherein, the right side of the second Raman cell is the incident window, the left side is the exit window, and the two windows are respectively set as the third quartz window and the fourth quartz window, and the Raman seed light and the second pumping beam After the light is combined on the second dichroic mirror, the mixed light first passes through the incident window of the second Raman cell, and is introduced into the hollow glass tube placed in the second Raman cell in the form of grazing incidence to undergo stimulated Raman amplification. process, and then the remaining pump light P and amplified Raman light S1 are transmitted through the exit window.
其中，所述的分光系统由3个高反镜、2个1/2波片和2个偏振分光片组成，泵浦光先经过第一1/2波片，通过调节1/2波片光轴的角度连续改变S和P偏振光光强，再经过第一偏振分光片进行分束，下方透射的光束为第一束泵浦光，右方反射的光束为第二束泵浦光。Wherein, the spectroscopic system is composed of 3 high reflection mirrors, 2 1/2 wave plates and 2 polarizing spectroscopic plates, the pump light first passes through the first 1/2 wave plate, and then adjusts the 1/2 wave plate light The angle of the axis continuously changes the intensity of S and P polarized light, and then splits the beam through the first polarizing beam splitter. The beam transmitted below is the first beam of pump light, and the beam reflected on the right is the second beam of pump light.
其中，所述的准直透镜的聚焦焦点在置于第二个拉曼池内的空心玻璃管的输出端口。Wherein, the focus of the collimating lens is at the output port of the hollow glass tube placed in the second Raman cell.
其中，所述的第一二相色镜为对拉曼光高透，对泵浦光高反；第二二相色镜为对拉曼光高透，对泵浦光高反。Wherein, the first dichroic mirror is highly transparent to Raman light and highly reflective to pump light; the second dichroic mirror is highly transparent to Raman light and highly reflective to pump light.
对于稳态受激拉曼散射过程，在小信号增益条件下（即可忽略泵浦光强的损耗），放大拉曼光增长满足：For the steady-state stimulated Raman scattering process, under the condition of small signal gain (that is, the loss of pump light intensity can be ignored), the amplified Raman light growth satisfies:
Is(z)=Is(0)exp(gIpz)I s (z)=I s (0)exp(gI p z)
其中：Is(z)为增长的放大拉曼光强，Is(0)为最初的拉曼种子光强，g为稳态增益系数，Ip为泵浦光强，z为拉曼光和泵浦光有效相互作用长度。上式表明受激拉曼散射过程中，放大拉曼光强与拉曼种子光强成正比，与相互作用长度z成指数增长关系。Where: I s (z) is the growing amplified Raman light intensity, I s (0) is the initial Raman seed light intensity, g is the steady-state gain coefficient, I p is the pump light intensity, z is the Raman light Effective interaction length with pump light. The above formula shows that in the process of stimulated Raman scattering, the amplified Raman light intensity is proportional to the Raman seed light intensity, and has an exponential growth relationship with the interaction length z.
与传统的自带种子光的受激拉曼散射波长变换相比，依据本发明的受激拉曼放大有如下两个明显优点：Compared with the traditional wavelength conversion of stimulated Raman scattering with seed light, the stimulated Raman amplification according to the present invention has the following two obvious advantages:
1）、由于第二束泵浦光以掠入射方式导入并被束缚在空心玻璃管内，则泵浦光在整个空心玻璃管内的功率密度较大，非常有利于进行受激拉曼散射放大过程。1) Since the second beam of pump light is introduced in a grazing incidence mode and is bound in the hollow glass tube, the power density of the pump light in the entire hollow glass tube is relatively high, which is very conducive to the amplification process of stimulated Raman scattering.
2）、由于拉曼种子光和第二束泵浦光均被束缚在空心玻璃管内，两束光的有效相互作用长度（理论上为整个空心玻璃管长度）大大增加，使得泵浦光容易被大量的消耗，转化为拉曼光，即量子转化效率将大大提高。2) Since both the Raman seed light and the second pump light are confined in the hollow glass tube, the effective interaction length of the two beams of light (theoretically the length of the entire hollow glass tube) is greatly increased, making the pump light easily absorbed A large amount of consumption will be converted into Raman light, that is, the quantum conversion efficiency will be greatly improved.
附图说明Description of drawings
图1为本发明基于空心玻璃管且自带拉曼种子光的气体受激拉曼放大器结构示意图。Fig. 1 is a schematic structural diagram of a gas-stimulated Raman amplifier based on a hollow glass tube with Raman seed light according to the present invention.
其中1-泵浦激光器，2-分光系统，3-第一二相色镜，4-第一聚焦透镜，5-第一石英窗口片，6-第一个拉曼池，7-第二石英窗口片，8-第二聚焦透镜，9-第一高反镜，10-第三1/2波片，11-第三聚焦透镜，12-第二高反镜，13-第二二相色镜，14-第三石英窗口片，15、24-充气阀门，16-第二个拉曼池，17、23-气压表，18-第四石英窗口片，19-空心玻璃管，20、21-空心玻璃管支架，22-准直透镜，25-分光棱镜组。1-pump laser, 2-spectroscopy system, 3-first dichroic mirror, 4-first focusing lens, 5-first quartz window, 6-first Raman cell, 7-second quartz Window plate, 8-second focusing lens, 9-first high reflection mirror, 10-third 1/2 wave plate, 11-third focusing lens, 12-second high reflection mirror, 13-second dichroic color Mirror, 14-the third quartz window, 15, 24-gas valve, 16-the second Raman cell, 17, 23-barometer, 18-the fourth quartz window, 19-hollow glass tube, 20, 21 -Hollow glass tube bracket, 22-collimating lens, 25-beam splitting prism group.
图2为受激放大拉曼光的量子转化效率随着第二束泵浦光强变化的曲线图（本发明的拉曼放大器和传统的双级联拉曼池受激拉曼）Figure 2 is a graph of the quantum conversion efficiency of stimulated amplified Raman light varying with the intensity of the second pump light (the Raman amplifier of the present invention and the conventional double-cascaded Raman cell stimulated Raman)
具体实施方式detailed description
详见图1所示。由图可见，本发明基于空心玻璃管且自带拉曼种子光的气体受激拉曼放大器包括：一台泵浦激光器1，一套将泵浦光分为两束的分光系统2，泵浦光高反且拉曼光高透的第一二相色镜3，第一束泵浦光的第一聚焦透镜4，第一个拉曼池6及其两端面10毫米厚密封法兰上各设直径30毫米的第一石英窗口片5、第二石英窗口片7，安装在第一个拉曼池6上的气压表23及充气阀门24，后向拉曼种子光的第二聚焦透镜8，用于第二束泵浦光光路延迟的第一高反镜9、第二高反镜12，第三1/2波片10，第二束泵浦光的第三聚焦透镜11，将拉曼种子光和第二束泵浦光合束的第二二相色镜13，第二个拉曼池16及其两端面10毫米厚密封法兰上各设直径30毫米的第三石英窗口片14、第四石英窗口片18，内置于第二个拉曼池内的空心玻璃管19及其两端支架20和21，安装在第二个拉曼池16上的气压表15及充气阀门17，输出放大拉曼光的准直透镜22，一组分光棱镜25。其中，第一个拉曼池6和第二个拉曼池16的主体均是内径26毫米、壁厚3毫米的不锈钢管，长度分别为300毫米和1200毫米；空心玻璃管19为石英材质，其内径为1.5毫米，长度为580毫米。See Figure 1 for details. It can be seen from the figure that the gas-stimulated Raman amplifier based on a hollow glass tube and with its own Raman seed light in the present invention includes: a pump laser 1, a set of spectroscopic system 2 that divides the pump light into two beams, and a pump laser The first dichroic mirror 3 with high light reflection and Raman light high transmittance, the first focusing lens 4 of the first beam of pump light, the first Raman cell 6 and the 10 mm thick sealing flanges on both ends thereof Establish the first quartz window plate 5 and the second quartz window plate 7 with a diameter of 30 mm, the air pressure gauge 23 and the inflation valve 24 installed on the first Raman cell 6, and the second focusing lens 8 for the Raman seed light backward , the first high reflection mirror 9, the second high reflection mirror 12, the third 1/2 wave plate 10, the third focusing lens 11 of the second pump light for the second pump light optical path delay, will pull The second dichroic mirror 13 for combining the Mann seed light and the second pump light, the second Raman pool 16 and the 10 mm thick sealing flanges on both ends of the second Raman cell are each equipped with a third quartz window plate 14 with a diameter of 30 mm. , the fourth quartz window sheet 18, the hollow glass tube 19 built in the second Raman cell and its two ends supports 20 and 21, the barometer 15 and the inflation valve 17 installed on the second Raman cell 16, the output A collimating lens 22 for amplifying Raman light, and a group of optical prisms 25 . Wherein, the main bodies of the first Raman cell 6 and the second Raman cell 16 are stainless steel tubes with an inner diameter of 26 mm and a wall thickness of 3 mm, and the lengths are respectively 300 mm and 1200 mm; the hollow glass tube 19 is made of quartz, It has an inner diameter of 1.5 mm and a length of 580 mm.
具体地说，泵浦激光器1输出的泵浦光通过分光系统2分成两束泵浦光。其中第一束泵浦光通过第一二相色镜3（对泵浦光高反，对拉曼光高透）反射和第一聚焦透镜4（焦距为250毫米）聚焦后经第一个拉曼池6的左侧入射窗口导入该拉曼池6内，随之产生光束质量较好的后向斯托克斯拉曼种子光，该拉曼种子光按原光路返回，依次经过第一聚焦透镜4、第一二相色镜3、第二聚焦透镜8（焦距为1000毫米，焦点在第二个拉曼池16内置的空心玻璃管19的输入端口）和第二二相色镜13以掠入射方式进入空心玻璃管19的输入端口，作为拉曼种子光，剩余的第一束泵浦光经第一个拉曼池6的右侧出射窗口透射出去；第二束泵浦光先后通过第一高反镜9、第二高反镜12进行光路延迟并经过中间的第三聚焦透镜11（焦距为1000毫米，焦点在空心玻璃管19的输入端口）聚焦，作为受激拉曼放大泵浦光，与后向拉曼种子光同时到达第二二相色镜13，然后在空间上进行合束后一并以掠入射方式导入空心玻璃管19进行受激拉曼放大。最后通过准直透镜22（焦距为300毫米，焦点在空心玻璃管19的输出端口）和分光棱镜组25把剩余的泵浦光P和放大拉曼光S1分开，从而得到单一的放大拉曼光。Specifically, the pump light output by the pump laser 1 is split into two beams of pump light by the light splitting system 2 . The first beam of pump light is reflected by the first dichroic mirror 3 (highly reflective to pump light and highly transparent to Raman light) and focused by the first focusing lens 4 (with a focal length of 250mm) and then passed through the first pull The incident window on the left side of the Man cell 6 is introduced into the Raman cell 6, and then a backward Stokes Raman seed light with better beam quality is generated. The Raman seed light returns according to the original optical path, and then passes through the first focusing Lens 4, the first dichroic mirror 3, the second focusing lens 8 (the focal length is 1000 mm, and the focus is at the input port of the hollow glass tube 19 built into the second Raman cell 16) and the second dichroic mirror 13 and Grazing incidence enters the input port of the hollow glass tube 19 as Raman seed light, and the remaining first beam of pump light is transmitted through the right exit window of the first Raman cell 6; the second beam of pump light successively passes through The first high-reflection mirror 9 and the second high-reflection mirror 12 perform optical path delay and focus through the third focusing lens 11 in the middle (the focal length is 1000 mm, and the focus is at the input port of the hollow glass tube 19), as a stimulated Raman amplification pump The Pu light and the backward Raman seed light arrive at the second dichroic mirror 13 at the same time, and then combined spatially, they are introduced into the hollow glass tube 19 in the form of grazing incidence for stimulated Raman amplification. Finally, the remaining pump light P and the amplified Raman light S1 are separated by the collimator lens 22 (the focal length is 300 mm, and the focal point is at the output port of the hollow glass tube 19) and the beam splitting prism group 25, thereby obtaining a single amplified Raman light .
本发明实施例，采用美国Continuum Nd:YAG激光器基频光1064nm作为泵浦光，以H2为受激拉曼散射介质，实现其一阶斯托克斯1900nm拉曼光种子光的产生及其受激拉曼放大。第一个拉曼池6和第二个拉曼池16均注入3.5MPa氢气。按照上述的实验步骤进行基于空心玻璃管且自带拉曼种子光的H2受激拉曼放大实验。在进行传统的双级联拉曼放大实验时，只需将上述实验过程中第二个拉曼池内置的空心玻璃管取出，重新充装氢气介质，其他光路不变。最后对上述两个受激拉曼光出光效率进行比较和分析。The embodiment of the present invention adopts American Continuum Nd: YAG laser fundamental frequency light 1064nm as pumping light, with H2 as the stimulated Raman scattering medium, realizes the generation of its first-order Stokes 1900nm Raman light seed light and its Stimulated Raman amplification. Both the first Raman cell 6 and the second Raman cell 16 are injected with 3.5MPa hydrogen. The H 2 stimulated Raman amplification experiment based on the hollow glass tube with Raman seed light was carried out according to the above experimental procedure. When carrying out the traditional dual-cascade Raman amplification experiment, it is only necessary to take out the hollow glass tube built in the second Raman cell during the above experiment and refill it with hydrogen medium, and the other optical paths remain unchanged. Finally, the light extraction efficiency of the above two stimulated Raman light is compared and analyzed.
图2绘出了受激放大拉曼光的量子转化效率随着第二束泵浦光光强变化的两条曲线图，分别对应传统的双级联拉曼放大器和本发明的拉曼放大器。从图2可以看出：当第二束泵浦光均为63.4mJ时，前者拉曼量子转化效率为22%，后者量子转化效率为32%，即量子转化效率提高了45%。整体而言，前者最大拉曼量子转化效率为23%，后者最大量子转化效率为35%，即最大量子转化效率提高了52%。实验结果表明：与传统的双级联拉曼池受激拉曼相比，依据本发明的受激拉曼放大效率获得了明显提高。Figure 2 depicts two graphs of the quantum conversion efficiency of stimulated amplified Raman light varying with the intensity of the second pump light, corresponding to the traditional double-cascaded Raman amplifier and the Raman amplifier of the present invention respectively. It can be seen from Figure 2 that when the second pump light is 63.4mJ, the Raman quantum conversion efficiency of the former is 22%, and the quantum conversion efficiency of the latter is 32%, that is, the quantum conversion efficiency is increased by 45%. Overall, the former has a maximum Raman quantum conversion efficiency of 23%, and the latter has a maximum quantum conversion efficiency of 35%, that is, the maximum quantum conversion efficiency has increased by 52%. The experimental results show that: compared with the stimulated Raman of the traditional double cascaded Raman cell, the amplification efficiency of the stimulated Raman according to the present invention is significantly improved.
Claims (6)
- Based on hollow glass tube and the gas excited Raman amplifier of Raman seed light, including a pumping laser are carried 1. a kind of Device (1), a set of beam splitting system (2), first Raman pond (6), second Raman pond (16), a hollow glass tube (19) and one Group Amici prism (25).The pump light of pump laser (1) output is divided into two beam pump lights, its feature by beam splitting system (2) It is：First beam pump light passes through backward Stokes Raman seed light and the second beam pump light caused by first Raman pond (6) Progress Raman light in the hollow glass tube (19) being placed in second Raman pond (16) is imported in a manner of glancing incidence simultaneously to be excited to put Greatly.
- 2. gas excited Raman amplifier according to claim 1, it is characterised in that：First beam pump light is focused on by the first two-phase color mirror (3) reflection and the first condenser lens (4) and imports first Raman pond (6) backward Stokes Raman seed light, is produced therewith, and the Raman seed light is returned by original optical path, sequentially passes through the first focusing Lens (4), the first two-phase color mirror (3), the second condenser lens (8) and the second two-phase color mirror (13) enter hollow glass tube (19) It is interior, as Raman seed light；Second beam pump light successively carries out light path by the first high reflective mirror (9), tertiary focusing lens (11), the second high reflective mirror (12) Delay, amplifies pump light as excited Raman, and the second two-phase color mirror (13) is reached simultaneously with backward Stokes Raman seed light, Then through the second two-phase color mirror (13) reflect with backward Stokes Raman seed light spatially reach coincidence after together with enter Excited Raman amplification is carried out in hollow glass tube (19)；The output light of hollow glass tube (19) output port successively by the 4th quartz window piece (18), collimation lens (22) and Amici prism group (25) separates remaining pump light P and amplification Raman light S1, so as to obtain single amplification Raman light.
- 3. gas excited Raman amplifier according to claim 1, it is characterised in that：Described Raman seed light and the second beam pump light is existed by the second condenser lens (8) and tertiary focusing lens (11) respectively Spatially focus on the input port of hollow glass tube (19).
- 4. gas excited Raman amplifier according to claim 1, it is characterised in that：It is incidence window on the right side of second described Raman pond (16), left side is exit window, and two windows are set to the 3rd stone English diaphragm (14) and the 4th quartz window piece (18), Raman seed light and the second beam pump light are in the second two-phase color mirror (13) Close the mixed light after beam and first pass through second Raman pond (16) incidence window, imported in a manner of glancing incidence be placed in second drawing together Excited Raman amplification process occurs for the hollow glass tube (19) in Man Chi (16), then remaining pump light P and amplification Raman light S1 is transmitted away by exit window.
- 5. gas excited Raman amplifier according to claim 1, it is characterised in that：Described beam splitting system (2) is made up of 3 high reflective mirrors, 2 1/2 wave plates and 2 polarization spectro pieces, and pump light first passes through One 1/2 wave plates, S and P polarization light light intensity are continuously changed by the angle for adjusting 1/2 wave plate optical axis, then by the first polarization spectro Piece is split, and the light beam of lower section transmission is the first beam pump light, and the light beam of right reflection is the second beam pump light.
- 6. gas excited Raman amplifier according to claim 2, it is characterised in that：The focused spot of described collimation lens (22) is defeated the hollow glass tube (19) being placed in second Raman pond (16) Exit port.
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| US4239995A (en) * | 1979-02-27 | 1980-12-16 | Westinghouse Electric Corp. | Metal vapor Raman frequency shifter |
| US8073017B1 (en) * | 2009-02-23 | 2011-12-06 | The United States Of America As Represented By The Secretary Of The Navy | System and method for generating eye-safe high intensity optical pulses with two backward-shifting raman cells |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4239995A (en) * | 1979-02-27 | 1980-12-16 | Westinghouse Electric Corp. | Metal vapor Raman frequency shifter |
| US8073017B1 (en) * | 2009-02-23 | 2011-12-06 | The United States Of America As Represented By The Secretary Of The Navy | System and method for generating eye-safe high intensity optical pulses with two backward-shifting raman cells |
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