中国激光, 2018, 45 (8): 0801005, 网络出版: 2018-08-11
885 nm直接抽运946 nm Nd∶YAG低温激光特性研究 下载: 864次
Characteristics of Cryogenically Cooled 946 nm Nd∶YAG Laser Under 885 nm Direct Pumping
激光器 946 nm激光 低温冷却 直接抽运 准三能级 lasers 946 nm laser cryogenically cooling direct pumping quasi-three level
摘要
对低温下885 nm抽运Nd∶YAG晶体946 nm准三能级激光性能进行了研究。将激光上、下能级的玻尔兹曼分布分数f1、f2作为温度的函数引入到激光速率方程中,定性分析了低温下小信号增益和激光阈值的变化规律。利用搭建的低温冷却系统研究了不同晶体温度下946 nm激光的输出性能,在210 K时获得了最大165 mW的激光输出,斜效率为36%,相比于常温下斜效率提高了71%。观察并分析了低温下1061 nm增益增强的现象,当温度低于190 K时,1061 nm激光增益显著提高,与946 nm激光形成竞争,导致946 nm激光输出降低。
Abstract
The characteristics of cryogenically cooled 946 nm Nd∶YAG laser under 885 nm low quantum defect pumping are studied. The Boltzmann distribution fraction of the upper and lower laser levels as a function of temperature is introduced into the laser rate equation, and the change rule of small signal gain and laser threshold at low temperature is analyzed qualitatively. A cryogenic system is developed to study the output characteristics of the 946 nm laser at low temperature. A maximum 165 mW laser output with the slope efficiency 36% is achieved at 210 K. The slope efficiency is increased by 71% compared with the room temperature operation. The gain of 1061 nm laser enhanced at low temperature is observed and analyzed. When the temperature is lower than 190 K, the gain of 1061 nm laser significantly increases and 1061 nm laser competes with 946 nm laser, resulting in a decrease of 946 nm laser output.
杨尚, 宋艳洁, 李隆普, 宗楠, 薄勇, 沈建平, 韦玮, 彭钦军, 许祖彦. 885 nm直接抽运946 nm Nd∶YAG低温激光特性研究[J]. 中国激光, 2018, 45(8): 0801005. Yang Shang, Song Yanjie, Li Longpu, Zong Nan, Bo Yong, Shen Jianping, Wei Wei, Peng Qinjun, Xu Zuyan. Characteristics of Cryogenically Cooled 946 nm Nd∶YAG Laser Under 885 nm Direct Pumping[J]. Chinese Journal of Lasers, 2018, 45(8): 0801005.