光学材料中横向SBS的稳态分析
Steadystate analysis of transverse SBS in optical materials
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摘要: 从非线性光学的耦合波理论出发，建立了种子光入射的窄带泵浦的横向受激布里渊散射的二维理论模型，并对稳态情形进行了数值模拟，得到了散射光强的二维分布。计算表明，散射光场在入射面内呈现出“局部集中”的特点，而且由于“空间压缩”效应，使得获得的最大散射光强远大于初始泵浦光强。还分析了光场及材料参数对获得的散射光强的影响，得出：入射的激光功率密度越大，光学元件的横向尺寸越长，材料的吸收系数越小，受激散射产生的散射光和弹性声波强度就越大，在材料内部引起的应力也越强，从而越有可能造成材料的破坏。Abstract: The coupled wave theory of nonlinear optics is adopted to establish twodimensional theoretical model of seeded、narrowband pumped transverse SBS. The numerical investigation of steadystate situation is offered and the planar distribution of scattering light intensity is obtained. The calculation shows that scattering light has the character of local concentration, and the maximum of scattering light intensity is much greater than the pump light intensity as a result of “space compression” effect. This paper also analyzes the variation of scattering light intensity with different pump conditions and different material parameters and puts some qualitative conclusions.
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Key words:
- optical materials /
- transverse sbs /
- intensive laser systems /
- laser induced damage
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