高能激光器气动窗口光束质量的评价方法探讨

Method of evaluating optical quality of aerodynamic windows for high energy lasers

通过对高能激光器气动窗口的研究现状和应用需求的分析 ,指出建立一套气动窗口光束质量的评价方法是十分必要的。在分析气动窗口工作机理和现有激光光束质量评价因子的基础上 ,提出一种评价气动窗口光束质量的方法 ,即用斯特列尔比来评价气动窗口的光束质量 ,并辅以相对衍射极限因子进行远场直观说明。分析表明 ,此种评价方法是可行的 ,并达到了不受限于气动窗口类别的光束质量评价的要求。

The laser output window is very important to the high power lasers. But when the power is very high the conventional output crystal window can not meet the needs of lasers. And the aerodynamic window can take the place of crystal window. This paper analyzes the current study situations and requirement for aerodynamic windows in the field of high power lasers, and then discusses the differences similarities of the laser beam quality evaluating factors' properties. According as the properties of aerodynamic windows it proposes a method of evaluating the laser beam quality of aerodynamic windows for high power lasers using Strehl ratio, at the same time using the beam factor as accessorial factor. This evaluating method is independent of the types of aerodynamic windows, and has been used in our studies well.