【摘要】 本文从高斯光束的光子数密度的速率方程出发,讨论了受激喇曼前向散射过程中光子数的转换规律,并根据高斯光束透镜变换的理论讨论了透镜焦距、位置和初始泵浦束的参数对受激喇曼的阈值和建立时间tg的影响。从理论上证明了最佳透镜焦距的存在。更多还原

【Abstract】 In this paper, based on the photon density rate equations of Gaussian beam we discussed the transformation rule of photons between the pumping beam and the stimulated Raman forward scattering (SRFS) beam. From the transformation theory of Gaussian beam by a thin lens, we also discussed the influence of the parameters, such as the focal length and position of the lens, fhe waist or the Raylegh length of the original pumping beam, on the threshold and generation time of SRFS. It was also showed that there is a optimum focal length corresponding to the minimum threshold power in the SRFS experiment.更多还原