中国激光, 2017, 44 (11): 1101005, 网络出版: 2017-11-17   

改善Nd∶YAG掠入射板条激光器增益介质热效应的研究 下载: 803次

Improvement of Gain Medium Thermal Effect in Nd∶YAG Grazing Incidence Slab Laser
作者单位
北京工业大学激光工程研究院, 北京 100124
摘要
增益介质的热效应是制约掠入射板条激光器获得高功率和高光束质量的重要因素。采用Nd∶YAG和蓝宝石晶体键合的方法, 研究掠入射板条激光器增益介质的热效应。理论模拟了Nd∶YAG与蓝宝石键合晶体增益介质的温度场分布和热焦距。实验对比了Nd∶YAG和蓝宝石键合晶体与单块Nd∶YAG晶体增益介质的输出特性: 在相同腔长和抽运的自由振荡条件下, 键合晶体的最大稳定输出功率比单块Nd∶YAG晶体提高了26%; 当抽运功率为44 W时, 键合晶体相对于单块Nd∶YAG晶体热焦距增长了69%; 同时, 键合晶体宽度、厚度方向的光束质量因子M2x=1.84、M2y=2.29, 单块Nd∶YAG晶体宽度、厚度方向的光束质量因子M2x=2.92、M2y=4.38。理论分析和实验结果表明, Nd∶YAG和蓝宝石键合晶体能够降低掠入射板条激光器增益介质的热效应, 有利于输出功率和光束质量的提高。
Abstract
The thermal effect of gain medium is an important factor to control the high power and high beam quality of the grazing incidence slab laser. The Nd∶YAG and sapphire crystal bonding method is used to study the thermal effect of grazing incidence slab laser. The temperature field distribution and thermal focal length of gain media of Nd∶YAG and sapphire bonding crystal are simulated theoretically. The output characteristics of gain media of Nd∶YAG and sapphire bonding crystal and single Nd∶YAG crystal are compared experimentally. The maximum stable output power of the bonding crystal is 26% higher than that of the single Nd∶YAG crystal, under the same condition of cavity length and pump free oscillation. When the pump power is 44 W, the thermal focal length of bonding crystal increased by 69% with respect to the single Nd∶YAG crystal. The beam quality factors along the width and thickness direction of bonding crystal are M2x=1.84 and M2y=2.29, respectively. The beam quality factors along the width and thickness direction of single Nd∶YAG crystal are M2x=2.92 and M2y=4.38, respectively. The theoretical analysis and experimental results show that the Nd∶YAG and sapphire bonding crystals can reduce the thermal effect of gain medium in grazing incidence slab laser, which is beneficial to improve the output power and beam quality.

季林涛, 邹岩, 李之通, 姜梦华, 雷訇, 李强. 改善Nd∶YAG掠入射板条激光器增益介质热效应的研究[J]. 中国激光, 2017, 44(11): 1101005. Ji LinTao, Zou Yan, Li Zhitong, Jiang Menghua, Lei Hong, Li Qiang. Improvement of Gain Medium Thermal Effect in Nd∶YAG Grazing Incidence Slab Laser[J]. Chinese Journal of Lasers, 2017, 44(11): 1101005.

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