中国激光, 2007, 34 (3): 359, 网络出版: 2007-03-15
激光二极管端面抽运Nd:GdYVO4晶体热效应分析及倍频研究
Characteristics of Laser Diode End-Pumped Laser Crystal on Thermal Effect and Second Harmonic Generation
激光技术 固体激光器 热效应 泊松方程 Nd:GdYVO4晶体 倍频 laser technique solid-state laser thermal effect Possion equation Nd:GdYVO4 crystal second harmonic generation
摘要
通过求解泊松热传导方程,得出了端面抽运下矩形截面Nd:GdYVO4激光晶体内部温度场分布以及Nd:GdYVO4激光晶体抽运端面达到热平衡后的热形变量。当抽运功率为12 W,抽运光斑半径wp=320 μm时,Nd:GdYVO4激光晶体的热形变量为0.855 μm。根据Nd:GdYVO4晶体内部温度场分布和晶体抽运端面达到热平衡后的热形变量,进而计算出晶体热焦距随抽运功率的变化。通过ABCD矩阵进行了腔参数优化,选取了更有效压缩KTP上基模光斑半径的V腔进行腔内倍频实验。在抽运功率为6.71 W时Nd:GdYVO4获得了1.73 W稳定倍频绿光输出,光-光转换效率达到25.8%,绿光非稳度为1.13%。
Abstract
Based on Possion equation, a thermal model of rectangle end-pumped Nd:GdYVO4 was bulit. The crystal temperature fields of Nd:GdYVO4 were distributed. Then the distortion on pump face was calculated. When the pumping power is 12 W, the radii of pump beam is wp=320 μm, the distortion of Nd:GdYVO4 is 0.855 μm. Based on the previous calculation, the focus of thermal lens changing with input power was calculated. Using ABCD matrix to optimize cavity parameters, V-shaped folded cavity which could compress the laser mode radii on KTP effectively was selected. With the pumped power of 6.71 W, an 1.73 W output power of stable frequency-doubled green light was achieved by V-shaped folded cavity, giving an optical-optical conversion efficiency of 25.8%, and green light non-stability Δ/=1.13%.
孙尧, 李涛, 于果蕾, 张帅一, 李健. 激光二极管端面抽运Nd:GdYVO4晶体热效应分析及倍频研究[J]. 中国激光, 2007, 34(3): 359. 孙尧, 李涛, 于果蕾, 张帅一, 李健. Characteristics of Laser Diode End-Pumped Laser Crystal on Thermal Effect and Second Harmonic Generation[J]. Chinese Journal of Lasers, 2007, 34(3): 359.