光-力耦合受激布里渊散射方程组
Opticalmechanical coupled SBS equations
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摘要: 采用位移形式表征各向同性介质的运动，从而对传统的SBS耦合波方程组进行改造，使之适用于多维的情况并体现光学理论和力学理论的耦合。采用有限差分方法数值求解了光学-力学耦合型后向SBS方程组，得到了瞬态的位移场、速度场和应力场。计算结果表明，当泵浦光光强为2.0×10 15W/m 2时，SBS可激发厚度为1cm的K9玻璃样品的表面产生出0.1nm量级的位移和10m/s量级的速度，对应的应力幅度达到10MPa量级。Abstract: A new type coulpled wave equations, whose acoustic branch is rewritten in terms of displacement, is established to describe SBS process. One dimensional backward SBS is researched by solving this coupled wave equations numerically and displacement and velocity profile in the entrance surface of pump laser are obtained, and the characteristics of SBS induced stress is presented. Calculation shows that the SBS induced surface displacement and velocity can reach the magnitude of 0.1nm and 10m/s respectively when pump intensity is 2.0×1015W/m2, and the corresponding stress exceeds 10MPa.The calculation results by new type equations agree well with those by traditional methods．
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Key words:
- optical materials /
- sbs /
- displacement /
- stress profile /
- laser-induced damage
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