介质参数对受激布里渊散射脉宽压缩的影响
Dependence of pulse duration on parameters of medium in Stimulated Brillouin Scattering
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摘要: 利用KrF激光和SF6介质从理论和实验上研究了声子寿命和增益系数等介质参数对SBS脉宽压缩比和能量反射率的影响。理论上采用一维瞬态模型对SBS过程进行数值模拟，考虑了瞬态过程、介质吸收以及泵浦耗空的影响，计算了SBS介质不同参数对脉冲压缩影响的规律。实验表明，在实验参数的变化范围内声子寿命越短、增益系数越小，越有利于脉宽压缩。在0.68MPa下，脉宽压缩比达到8。数值模拟了声子寿命和介质增益系数单独变化时对SBS过程影响的规律，发现在声子寿命和增益系数同时变化时，SBS对泵浦脉冲的压缩有最佳点。Abstract: Stimulated Brillouin Scattering (SBS) is a process to product the phase conjugated light. Now it is being pursued as a means for pulse compression, beam combination and wavefront reversal. To achieve a high quality short pulse beam, to select a proper medium is very important. In this paper, the effect of parameters of Brillouin mediums on pulse compression of Stimulated Brillouin Scattering process used as a SBS generator are shown theoretically and experimentally. The theoretical model includes transient process, absorption of medium, and pump depletion. The results show that pulse compression ratio is 8 in 0.68MPa. Dependence of pulse compression on the acoustic lifetime and Brillouin gain coefficients is investigated respectively. The results show that pulse compression versus parame
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Key words:
- stimulated brillouin scattering /
- brillouin medium /
- pulse compression
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