为了提高谐波转换效率和消除温升引起的晶体走离效应,对于非线性晶体温度场分布特点进行了分析与计算.同时研究了基波偏心辐射对KTP晶体温度场的影响.通过对腔内倍频KTP晶体工作特点的分析,建立了方形非线性晶体热模型并首次引入了方形晶体辐射偏心度的定义.基于热传导方程,得到了温度场分布的一般解析表达式.

In order to improve harmonic conversion efficiency and eliminate walk-off effect,temperature field of nonlinear crystal was accurately calculated. Through work state analysis of KTP crystal with intracavity doubling frequency,a thermal model of rectangle nonlinear crystal was buildt and the radiation eccentricity (RE) of a rectangle crystal was first defined. Based on heat conductive equation,a general analytical solution of temperature model was obtained and the temperature model influenced by eccentric radiated of fundamental wave was first investigated