激光技术2012，Vol.36Issue(1)：59-63,5.DOI:10.3969/j.issn.1001-3806.2012.01.016
腔内多模光束偏心辐射非线性晶体温度场分析
Temperature field of nonlinear crystal eccentric-radiated by intra-cavity multi-mode beam
摘要
Abstract
In order to improve the frequency doubling conversion efficiency of nonlinear crystal influenced by non-uniform temperature rise in high power green lasers, the temperature performance of nonlinear crystal with intracavity multi-mode frequency doubling was analytically investigated. According to the actual characteristics of nonlinear crystal with intra-cavity frequency doubling, based on the heat conduction equation, a general analytical expression of temperature field in nonlinear crystal eccentric-radiated by multi-mode fundamental wave was obtained. Hie result shows that when the waist spot radius of multi-mode light beam is 200u,m, the power of fundamental wave is 500W, and the maximum temperature rise of KTP crystal eccentric-radiated (eccentric degree f =0. 33) by fundamental harmonic is 79. 801, 4. 0% lower than the maximum temperature rise 83. 14T of KTP crystal center-radiated by fundamental harmonic with other conditions keeping the same. When the radiation eccentricity increases, the maximum temperature rise of KTP crystal can be effectively reduced. The thermal model of nonlinear crystal meets the actual requirement of green lasers, which will play an instructive role in elimination of nonlinear crystal heating effect and improvement of the harmonic conversion efficiency of nonlinear crystal.关键词
激光器/腔内倍频/多模光束/偏心辐射/KTP晶体/温度场Key words
lasers/intra-cavity frequency doubling/multi-mode beam/eccentric radiation/ KTP crystal/temperature field分类
信息技术与安全科学引用本文复制引用
刘小建,李隆,杜长龙,史霞,史彭,甘安生..腔内多模光束偏心辐射非线性晶体温度场分析[J].激光技术,2012,36(1):59-63,5.基金项目
西安市科技局创新支撑计划资助项目(CXY1015(6)) （CXY1015(6）
