HF激光器腔内气动介质有序扰动的数值模拟  

Numerical Simulation of Ordered Aero-optical Aberrations in Hydrogen Fluoride Chemical Lasers

作　　者：许晓军[1] 陆启生[1] 袁圣付[1] 刘泽金[1] 

机构地区：[1]国防科技大学理学院,湖南长沙410073

出　　处：《中国激光》2002年第2期113-118,共6页Chinese Journal of Lasers

摘　　要：通过对化学激光器腔内介质不均匀性的分析指出 ,HF连续波化学激光器 (CWCL)腔内的气动介质的有序不均匀扰动将是影响输出光束质量的主要因素之一。利用建立的激光器腔内二维折射率分布模型对基频和泛频HFCWCL有无激射条件下腔内气动介质的有序分布进行了数值计算。分析比较了 3 Slot(3S)和 2 Slot(2S)喷管结构的激光器的性能和气动介质对光束质量的影响。数值模拟指出 ,在望远式非稳腔输出条件下 ,腔内 1m喷管阵列的气动介质有序不均匀扰动对光束质量的影响不大 ,但由于相位扰动的均方差将随喷管阵列长度的平方增大 ,对于HF泛频输出尤应重视。另外 ,3S在工作性能和光束质量方面均优于 2S。It was pointed out that the ordered aero-optical aberrations in Hydrogen Fluoride (HF) continuous wave chemical laser (CWCL)'s cavity is one of the main factors influencing laser beam quality by the analysis of the inhomogeneous medium in laser cavity. The 2D refractive index model in HF CWCL was set up to simulate the inhomogeneity distributions in main-tone/over-tone HF CWCL's cavities in the condition of power/zero-power output. With it, the performance and beam quality in 3-Slot (3S) and 2-Slot (2S) structure lasers were computed and analyzed. By the simulation, it was shown that the ordered aero-optical aberrations in the telescopic unstable cavity are not significant in nozzles array of 1 m length. But with the increase of the length of nozzles array, it will be important, especially for the over-tone HF lasers. In addition, the performance and beam quality of 3S are better than that of 2S.

关 键 词：HF化学激光器 腔内介质 气动介质 有序扰动 数值模拟 

分 类 号：TN248.5[电子电信—物理电子学]