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研究大型光学元件中横向受激布里渊散射的特点和破坏机制,以及横向受激布里渊散射的抑制方案。在理论分析的基础上,进行数值模拟。当入射光强足够高,材料的横向尺寸足够大时,在受激散射过程中产生的弹性声波场有可能超出材料的抗拉强度,从而引起力学破坏;增加泵浦光带宽可以显著降低散射光的增益。强激光辐照下的大尺寸光学元件中很容易激发横向受激布里渊散射;对于大多数强激光系统,20GHz的带宽已经足以抑制TSBS带来的影响。
To investigate the characteristics and failure mechanism of transversely stimulated Brillouin scattering in large optical components and the suppression scheme of transversely stimulated Brillouin scattering. On the basis of theoretical analysis, numerical simulation is carried out. When the incident light intensity is high enough and the transverse dimension of the material is large enough, the elastic acoustic wave field generated in the stimulated scattering process may exceed the tensile strength of the material, causing mechanical failure. Increasing the pump light bandwidth can significantly reduce the scattered light Gain. Laterally-stimulated Brillouin scattering is easily stimulated in large-size optics under intense laser irradiation; the bandwidth of 20 GHz is sufficient to suppress the effects of TSBS on most intense laser systems.