【摘要】 当激光入射到非均匀的各向同性等离子体时,垂直于主密度梯度方向的密度分布会发生变化,使临界面呈现波纹。本文讨论了法向入射情况下波纹临界面的共振吸收和二次谐波产生,导出了吸收系数和转换系数的解析表达式。利用这种机制可以合理地解释线性理论与实验结果的偏离。更多还原

【Abstract】 When laser beam is incident on an inhomogeneous isotropic plasma, the variations in density profile perpendicular to main density gradient may develop, producing a rippling of critical surface. We have discussed resonant absorption and second-harmonic generation at the rippled critical surface in the case of normal incidence. Analytic expressions for absorption and transformation coefficients are derived. It is possible to explain reasonably the deviation of linear theory from experimental results with this mechanism.更多还原