气流与化学激光中的碰撞和非均匀加宽效应——理论分析模型

本文把用于气流与化学激光性能计算的理论模型作了分析比较,包括常用的Lorentz-Gauss谱线形因子近似、本文提出的矩形谱线形因子近似以及文献5]的理论。对气流化学激光的简化扩散混合模型,文中简要地导出了与上述诸理论相对应的具体结果。分析和计算表明:在碰撞与非均匀加宽同时起作用,特别是非均匀加宽占优势的情况下,两种谱线形因子近似以及文献5]理论的结果三者之间存在显著的差异;矩形谱线形因子近似要比常用的Lorentz-Gauss谱线形因子近似精确,而矩形谱线形因子近似的计算量要比Lorentz-Gauss谱线形因子近似的计算量少。 关键词：

COLLISIONAL AND INHOMOGENEOUS BROADENING EFFECTS IN GAS-FLOW AND CHEMICAL LASERS——THE THEORETICAL MODELS

The analytical models which are used to predict the performance of gas-flow and chemical lasers are enumerated and compared. These analytical models include the currently accepted theory of Lorentz-Gauss line shape factor, the present theory of rectangular line shape factor and the theory presented in ref. 5]. For the idealized configuration of the mixing layer of diffusion chemical lasers, the specific results corresponding to the theories mentioned above are developed in brief. Analysis shows that for the general case in which the transition is simultaneously inhomogeneous broadened and collisionally broadened, particularly for the case in which the inhomogeneous broadening is dominant, the difference among the results of the two theories of line shape factor and the theory of article 5] are quite significant. The results of the theory of rectangular line shape factor are more precise than those of Lorentz-Gauss line shape factor. And the computing-time required by the theory of rectangular line shape factor is less than that of Lorentz-Gauss line shape factor.