自散焦介质抑制增益介质热像效应的数值研究  

Numerical Study of Suppression Effect of Self-defocusing Media on Hot Images in a Laser Beam Through Nonlinear Media with Gain

作　　者：王友文[1] 刘雪琳[1] 游开明[1] 陈列尊[1] 陆世专[1] 戴志平[1] 肖宾宾[1] 

机构地区：[1]衡阳师范学院物理与电子信息科学系,湖南衡阳421008

出　　处：《衡阳师范学院学报》2012年第6期20-24,共5页Journal of Hengyang Normal University

基　　金：湖南省自然科学基金项目(11JJ3076);湖南省教育厅资助科研项目(12A020);衡阳市科技局科技发展计划项目(2010KG59)

摘　　要：抑制热像形成对提高高功率激光系统中光学元件的安全有重要意义。运用基于快速傅里叶变换的光传输程序,数值研究了自散焦介质对强激光经过增益介质形成热像的抑制效果。结果表明,自散焦介质置于增益非线性介质的前面和后面,选择适当参量,均能有效抑制热像的形成,且自散焦介质与增益介质越薄,二者的B积分越相近,增益介质的增益系数越大,抑制效果越好。It is important for safety of optical elements of high-power laser system to suppress the formation of hot images. The suppression effect of self-defocusing media on hot images of active media was numerically investigated. It is shown that hot images may be successfully suppressed through self-defocusing media located in the front or at the back of the active medium. Furthermore, the thinner the self-defocusing medium and the active medium, the more identical the B integral of the self-defocusing media and the active media, the bigger gain coefficient of active media, the better suppression effect of self-defo- cusing media on hot images of active media.

关 键 词：高功率激光 热像抑制 增益介质 自散焦介质 

分 类 号：O437.5[机械工程—光学工程]