介质参数对受激布里渊散射特性的影响
Influence of medium parameters on the characteristics of stimulated Brillouin scattering
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摘要: 采用一维瞬态模型对受激布里渊散射（SBS）过程进行了数值模拟，研究了介质参数对SBS特性的影响规律；选取FC-72、FC-75、CCl4、CS2、丙酮、苯以及CCl2/乙醇的混合溶液等作为散射介质，在Nd∶YAG调Q激光系统下进行了实验研究，比较了各种介质所产生的SBS脉宽、能量反射率和波形之间的差异，由此讨论了介质参数对SBS特性的影响。结果表明，介质增益系数越大，吸收系数越小，SBS能量反射率就越大；吸收系数越大，产生的SBS脉宽就越窄；声子寿命越短，SBS波形前沿就越陡，并且越容易出现调制现象。Abstract: SBS process was simulated numerically based on a one-dimensional transient model. The influence of Brillouin media on SBS characteristics was studied. A variety of media, such as FC-72, FC-75, CCl4, CS2, Acetone, Benzene, and mixture liquid of CCl4/Ethanol, are investigated experimentally with a Nd∶YAG Q-switched laser, and comparison is made between the SBS characteristics, such as the SBS pulse-width, the energy reflectivity and the SBS pulse shape. It is shown that a large gain factor corresponds to a small absorption coefficient and a large SBS energy reflectivity; a large absorption coefficient corresponds to a short SBS pulse-width; and a short phonon lifetime corresponds to a short SBS rise time. The modulation of SBS pulse shape tends to occur with a short phonon lifetime.
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