分析了Er3+离子的能级结构特性和Er:YAG四能级系统的激光速率方程。采用了双灯,双椭圆腔和窄脉冲放电等方式提高了抽运效率; 通过提高激光谐振腔的反射率,降低阈值,从而实现了输出2.94 μm的高重频窄脉冲激光; 采用高压高速层流冷却技术降低了热效应的影响。Er3+:YAG激光器的重复频率为40 Hz,单脉冲输出能量为0.5 J,满足实际应用需要。

Characteristics of Er level structure and laser rate equation of an Er3+:YAG four-level system are analyzed. In the laser system, dual-lamp laser, double-elliptical cavity and spike pulse discharge are used to increase pump rate. Through increasing reflectivity of laser cavity and decreasing laser threshold Er3+:YAG laser can output 2.94 μm high-repetition-rate spike pulse laser. In order to eliminate the influence of heat effect, high-tension and high-speed laminar flow cooling technology is adopted. 2.94 μm Er3+:YAG laser with repetition rate of 40 Hz and single pulse energy of 0.5 J is achieved.