半导体泵浦固体激光器热透镜效应测量方法
卞进田，王玺
(脉冲功率激光技术国家重点实验室(电子工程学院)，安徽合肥230037)
摘要:为了测量光泵浦激光晶体的热透镜焦距值，分析了基模高斯光束的特性，
给出了在已知基模高斯光束三个以上不同位置处光斑尺寸时求解高斯光束特征参数的方法，并提出了存在测量误差时的数值处理方法。利用计算机模拟构造高斯光束并利用此高斯光束在不同位置处的光斑半径大小值与被测高斯光束光斑半径测量值相减的平方和作为误差函数的值，误差函数值最小的构造高斯光束
就是被测高斯光束。实验测量了半导体泵浦的Nd:YAG 激光棒的热效应，
给出了632.8nm 红光的热透镜值与泵浦电流的关系。
关键词:半导体泵浦激光器；Nd:YAG ；热透镜效应；高斯光束；数值模拟
中图分类号:TN248.1文献标志码:A 文章编号:1007-2276(2013)S2-0391-04
Measuring thermal lens effect of LD ?pumped
solid ?state laser
Bian Jintian,Wang Xi
(State Key Laboratory of Pulsed Power Laser Technology(Electronic Engineer Institute),Hefei 230037,China)
Abstract:For measuring the thermal lens focal length of laser crystal pumped by LD laser,the characteristics of Gaussian beam were analyzed,and parameters of Gaussian beam were solved with more than three different spots beam size.Numerical simulation using data with error were proposed.Gaussian beams,with different parameters,were constructed to match experimental data.Error function was expressed by sum squaring theory data of constructed Gaussian beam minus experimental data.The constructed Gaussian beam with minimal error is the one,measured in the experiment.Thermal lens effect of LD ?pumped Nd:YAG laser crystal was measured,and the thermal focal length at 632.8nm wavelength,vs different pumping electrical current,was acquired.
Key words:LD ?pumped laser;Nd:YAG;thermal lens effect;gaussian beam;numerical simulation 收稿日期:2013-08-05;修订日期:2013-09-15
基金项目:电子工程学院博士启动基金(KY11108);脉冲功率激光技术国家重点实验室基金(KY13C162)
作者简介:卞进田(1979-),男,讲师,博士,主要从事光电对抗技术方面的研究。Email:bianjt@https://www.doczj.com/doc/dc12366032.html, 第42卷第S2期
红外与激光工程2013年12月
Infrared and Laser Engineering Dec