大气中受激拉曼散射的理论和数值计算

A SEMI-CLASSICAL THEORY AND NOMERICAL COMPUTATION SRS IN THE ATMOSPHERE

从量子力学基本原理出发得到受激拉曼散射（ＳＲＳ）半经典理论下的动力学方程。理论上证明了只有当上下能级间距较大时经典描述才适用。数值模拟了强激光通过大气层时受激转动拉曼散射（ＳＲＲＳ）的几种效应，其中包括拉曼转换特性，ＳＲＲＳ的阈值，分子“记忆”对脉冲串传输的影响。

In this paper,we present the dynamical equations for the Stimulated Raman Scat-tering under the semiclassical description form the fundamental principals of the quantum mechan-ics,and analyze in theory to point out that the semi-classical description will reduce to the clas-sical case when △E,the difference between the upper and lower energy levels,is large enough(△E>> kT).Making numerical simulation of the above-mentioned equations,we analyze effectsof the Stimulated Rotational Rarnan Scattering(SRRS)of strong laser beams in the atmos-phere,including Raman transforming property,the threshold of the SRRS and the influence of“the memory of the molecule”upon the propagation of the pulse series.