The light diffraction effect on stimulated Raman scattering
The light diffraction effect on stimulated Raman scattering
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DOI：
10.1063/1.4941967
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发表时间：
2016-02
影响因子：
2.2
通讯作者：
Zhenming Liu;Bin Li;Xiaoyan Hu;J. Xiang;C. Zheng;Lihua Cao;L. Hao
中科院分区：
文献类型：
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作者：
Zhenming Liu;Bin Li;Xiaoyan Hu;J. Xiang;C. Zheng;Lihua Cao;L. Hao
利用LAP3D模拟了不同入射光尺寸下的受激拉曼散射。拉曼散射的反射率对入射光的单个散斑的大小非常敏感。当散斑宽度较小时，反射率较小，这可以用光衍射的影响来解释。对于非均匀等离子体，正密度梯度下的反射率比负密度梯度下的反射率大，这与理论结果一致。经连续相位板平滑后的入射光含有许多散斑，且具有一定的光强分布。强度曲线上的分数功率非常重要，因为高强度功率可以激发受激拉曼散射，降低平均强度的阈值。
The stimulated Raman scattering is simulated with different size of incident light using code LAP3D. The reflectivity of Raman scattering is very sensitive to the size of single speckle of the incident light. Small reflectivity is obtained when width of speckle is small, which is explained by the effect of light diffraction. For inhomogeneous plasma, the reflectivity is larger with a positive density gradient than that with a negative density gradient, which is consistent with the theory result. The incident light smoothed by the continuous phase plate contains many speckles and has an intensity distribution. The fractional power above intensity profile is very important, because the high intensity power can excite the stimulated Raman scattering and reduce the threshold of average intensity.