激光二极管抽运铯蒸气激光实现高效率瓦级输出

Diode-Pumped Cesium Vapor Laser with High Efficiency Output

采用中心波长为852.3 nm、线宽为0.17 nm的光纤耦合半导体激光器作为抽运源,室温下充入60 k Pa氦气和20 k Pa乙烷、5 mm长的铯蒸气池作为激光增益介质开展了端面抽运铯蒸气激光实验研究。蒸气池工作温度为107.6℃时,改变输出镜反射率优化铯激光输出性能,获得最佳输出镜反射率为48.79%。连续抽运模式下,注入抽运功率为4.76 W时获得1.16 W的894.57 nm连续激光输出,斜效率为28.8%,光光转换效率达24.4%;脉冲抽运模式下,注入抽运功率为14.1 W时获得了2.5 W稳定铯激光输出。

Employing a fiber- coupled diode- laser with a center wavelength of 852.3 nm and a linewidth of 0.17 nm as the pump source, and using a 5 mm long cesium vapor cell with 60 kPa helium and 20 kPa ethane as laser medium, an experimental investigation of LD- end- pumped cesium vapor laser is carried out. Under an operating temperature of 107.6 ℃ , the laser output performance is optimized by changing the reflectivity of output coupler. Using an optimized reflectivity of 48.79% , 1.16 W 894.57 nm laser is obtained at an incident continuous- wave pump power of 4.76 W, corresponding an optical- optical efficiency of 24.4% and a slopeefficiency of 28.8% , respectively.Steady cesium laser with an output power of 2.5 W is obtained under 14.1 W pulsed pump power.