碰撞对受激Raman散射的影响

The effect of collision on stimulated Raman scattering

从动力学方程出发 ,引入有效碰撞 ,讨论了碰撞对受激Raman散射线性增长率的影响 .结果表明 ,碰撞阻尼和Landau阻尼使得受激Raman散射线性增长率有了实质性的下降 ,受激Raman散射只能发生在电子温度和电子密度平面的一个有限区域 .现在的理论模型能够解释受激Raman散射光谱上存在的“缝”(gap)现象 .

Starting from kinetic equations, we discussed stimulated Raman scattering (SRS) by including both Landau damping (LD) and the collisional damping (CD). It was found that the linear growth rate of SRS is reduced substantially due to LD and CD. SRS can occur only for a region determined by both electron temperature and density. Gap in the spectrum corresponding to Raman scattering can be explained by the present model.