Stimulated raman scattering (SRS) is an effective method for expanding the spectral range of high power lasers, especially in the regime of near IR and middle IR. We report the SRS of high pressure H2 with a multipl...Stimulated raman scattering (SRS) is an effective method for expanding the spectral range of high power lasers, especially in the regime of near IR and middle IR. We report the SRS of high pressure H2 with a multiple-pass cell configuration. The SRS with the multiple-pass cell configuration is found to be very efficient for reduction of threshold of the first Stokes (S1). Due to the coherent SRS (CSRS) process, the multiple-pass cell configuration is more effective for reduction of the threshold for the second Stokes (S2) SRS and for increasing the conversion efficiency of S2. This contributes to the relatively low conversion efficiency of S1 for the multiple-pass cell configuration. Multiple-pass cell SRS is also found to be very effective for improving the beam quality and the stability of S1.展开更多
研究了基于双拉曼池的氢气后向受激拉曼散射及其放大特性。两个拉曼池内均充入高压氢气,前级拉曼池用于产生种子光,后级拉曼池用于实现种子光放大。测量了不同抽运光能量下的输出斯托克斯能量,以及抽运光能量在两拉曼池不同配比时的输...研究了基于双拉曼池的氢气后向受激拉曼散射及其放大特性。两个拉曼池内均充入高压氢气,前级拉曼池用于产生种子光,后级拉曼池用于实现种子光放大。测量了不同抽运光能量下的输出斯托克斯能量,以及抽运光能量在两拉曼池不同配比时的输出斯托克斯能量。当分配给前级拉曼池能量100 m J,后级拉曼池能量175 m J时,获得单脉冲44.0 m J的斯托克斯光,相应的光子转化率为28.6%。使用速率方程对拉曼放大部分进行了数值模拟,输出斯托克斯能量的理论值与实验值基本相符。数值模拟表明,在种子光能量等于或大于抽运光时,受激拉曼放大依然可以实现线性转化。根据模拟结果,提出了利用拉曼放大来实现多束激光串联合成输出的设想。展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11304311 and 11475177
文摘Stimulated raman scattering (SRS) is an effective method for expanding the spectral range of high power lasers, especially in the regime of near IR and middle IR. We report the SRS of high pressure H2 with a multiple-pass cell configuration. The SRS with the multiple-pass cell configuration is found to be very efficient for reduction of threshold of the first Stokes (S1). Due to the coherent SRS (CSRS) process, the multiple-pass cell configuration is more effective for reduction of the threshold for the second Stokes (S2) SRS and for increasing the conversion efficiency of S2. This contributes to the relatively low conversion efficiency of S1 for the multiple-pass cell configuration. Multiple-pass cell SRS is also found to be very effective for improving the beam quality and the stability of S1.
文摘研究了基于双拉曼池的氢气后向受激拉曼散射及其放大特性。两个拉曼池内均充入高压氢气,前级拉曼池用于产生种子光,后级拉曼池用于实现种子光放大。测量了不同抽运光能量下的输出斯托克斯能量,以及抽运光能量在两拉曼池不同配比时的输出斯托克斯能量。当分配给前级拉曼池能量100 m J,后级拉曼池能量175 m J时,获得单脉冲44.0 m J的斯托克斯光,相应的光子转化率为28.6%。使用速率方程对拉曼放大部分进行了数值模拟,输出斯托克斯能量的理论值与实验值基本相符。数值模拟表明,在种子光能量等于或大于抽运光时,受激拉曼放大依然可以实现线性转化。根据模拟结果,提出了利用拉曼放大来实现多束激光串联合成输出的设想。