聚焦泵浦条件下固体介质中受激布里渊散射过程的数值研究
Numerical study on SBS process in fused silica glass under focal pumping
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摘要: 在非线性光学耦合波方程组中加入聚焦项，使之能够描述聚焦泵浦条件下的受激布里渊散射过程（SBS）。利用改进的SBS方程组，模拟了聚焦泵浦条件下熔石英玻璃棒中的SBS过程，给出了SBS反射率与泵浦激光能量的依赖关系，发现散射光脉冲中存在“聚焦刺”，并通过分析SBS诱导产生的应力场的特征对布里渊介质的安全性进行了评估，理论分析的结果与Yoshida等人的实验结果一致。Abstract: Taking account of spatial dependence in the propagation direction of focused laser beams, the SBS process in fused silica glass is simulated numerically. The dependence of pump energy on SBS reflectivity is presented, which shows good agreement with Yoshida's experiment results. The "focused spike" in scattering pulse is observed theoretically and the influence of SBS on optical damage, under focusing condition, is discussed. The simulation shows that under the condition of focal pumping the presence of SBS would strongly limit the amplitude of stress induced by single longitudinal laser.
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