LD端面泵浦棒状Nd:YAG晶体热效应分析  

Thermal effect analysis of LD end-pumped rod Nd:YAG crystal

作　　者：焦文龙 李武军[1] 郭苗迪 张佩[1] JIAO Wenlong;LI Wujun;GUO Miaodi;ZHANG Pei(School of Basic Science,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学基础学院,西安710021

出　　处：《激光杂志》2025年第1期40-45,共6页Laser Journal

基　　金：国家自然科学基金项目(No.12304405)。

摘　　要：为了解决LD端面泵浦棒状Nd:YAG晶体引起的热效应问题,建立了Nd:YAG晶体热模型,利用热传导理论,采用有限元分析法,对晶体工作时的温度场分布,应力场分布和入射端面的热致变化量情况进行了定量计算,并分析了泵浦光斑半径与泵浦功率对晶体温度场及应力场的影响。结果表明:当泵浦功率为10 W,光斑半径为300μm时,晶体入射端面的最高温度为316 K,在侧面无约束和施加约束时,晶体单位面积应力最大值分别为1.86×10^(7)Pa和3.28×10^(7)Pa,晶体入射端面的最大形变量分别2.81×10^(-4)mm和3.01×10^(-4)mm。晶体入射端面的最高温度,单位面积上最大应力以及热致形变量会随泵浦功率的增大而增大,随光斑半径的增大而减小。该结果为优化LD端面泵浦Nd:YAG晶体激光器的设计,减小晶体的热效应提供了重要理论依据。In order to solve the problem of thermal effect caused by LD end-pumped rod Nd:YAG crystal,a thermal model of Nd:YAG crystal was established,and the temperature field distribution,stress field distribution and thermal variation of incident end face were quantitatively calculated by using heat conduction theory and finite element analysis method.The influence of pumping spot radius and pumping power on crystal temperature field and stress field is also analyzed.The results show that:When the pump power is 10 W and the spot radius is 300μm,the maximum temperature of the incident end face of the crystal is 316K,and the maximum stress per unit area of the crystal is 1.86×10^(7)Pa and 3.28×10^(7)Pa,respectively,when the side is unconstrained and when the side is constrained.The maximum shape variables of the incident crystal end face are 2.81×10^(-4)mm and 3.01×10^(-4)mm,respectively.The maximum temperature,the maximum stress per unit area and the thermoforming variable of the incident end face of the crystal increase with the increase of the pump power,and decrease with the increase of the spot radius.The results provide an important theoretical basis for optimizing the design of LD end-pumped Nd:YAG crystal laser and reducing the thermal effect of the crystal.

关 键 词：端面泵浦 温度场 热形变 ND:YAG晶体 有限元分析 

分 类 号：TN248.1[电子电信—物理电子学]