大气热晕效应引起的激光焦移的计算与分析

计算物理 ›› 2002, Vol. 19 ›› Issue (5): 449-452.

大气热晕效应引起的激光焦移的计算与分析

万敏, 苏毅

中国工程物理研究院应用电子学所, 四川绵阳 621900

收稿日期:2001-01-16 修回日期:2001-09-03 出版日期:2002-09-25 发布日期:2002-09-25
作者简介:万敏(1970-),女,博士,主要从事激光技术领域研究工作,四川绵阳919-1012信箱621900.
基金资助:
国家863激光技术领域资助项目

COMPUTATION AND ANALYSIS ON FOCUS SHIFT OF LASER CAUSED BY ATMOSPHERIC THERMAL BLOOMING

WAN Min, SU Yi

Institute of Applied Electronics, Mianyang 621900, China

Received:2001-01-16 Revised:2001-09-03 Online:2002-09-25 Published:2002-09-25

摘要/Abstract

摘要： 采用薄透镜组合的半解析近似方法,研究了大气中的热晕效应对激光聚焦的影响.用该计算方法得出结论:大气热晕效应对高功率激光聚集光束传输的影响与其初始功率、发射口径、传输路径及大气吸收系数有关.在吸收系数随距离增加而减少的光程上(如上行传输),热晕将导致焦点向远离发射点方向移动,而在吸收系数随传输距离增加而增加的光程上(如下行传输),热晕将导致焦点向靠近发射点方向移动.

关键词: 热晕, 非均匀吸收介质, 焦移

Abstract: The focus shift of laser caused by atmospheric thermal blooming is studied. An approximate computational method of thin lens group is used, which is simple and quick. The results are as follows. The effect of atmospheric thermal blooming on high power lasers is related to the initial power, the emitting aperture diameter, the propagation path and the atmospheric absorption coefficient. The focus will shift along the project direction when the absorption coefficient decreases with the increase of the propagation path, while it will shift against the project direction when the absorption coefficient increases with the increase of the propagation path.

Key words: thermal blooming, nonuniform absorption medium, focal shift

中图分类号:

TN24

万敏, 苏毅. 大气热晕效应引起的激光焦移的计算与分析[J]. 计算物理, 2002, 19(5): 449-452.

WAN Min, SU Yi. COMPUTATION AND ANALYSIS ON FOCUS SHIFT OF LASER CAUSED BY ATMOSPHERIC THERMAL BLOOMING[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2002, 19(5): 449-452.