摘要
理论和实验研究了激光器谐振腔失谐对激光器性能的影响。一方面,理论上,基于准连续二极管泵浦、电光调Q固体激光器的特点,建立了包含谐振腔失谐修正函数的速率方程模型。通过数值仿真,模拟了不同激光模式、光斑半径、孔阑半径、孔阑位置情况下,谐振腔失谐对激光器损耗以及激光性能的影响。另一方面,实验测量了谐振腔失谐对激光器性能的影响。对于长250 mm、最小孔阑半径3.5 mm的凹凸非稳腔,凹面全反镜失谐比凸面输出镜失谐对激光器性能的影响大,当凹面全反镜水平方向失谐角度由0增加到490μrad时,激光能量由220 m J下降到150.9 m J,下降31.4%,脉冲宽度由5 ns增大到6.5 ns,实验结果和理论分析结果基本相符,说明激光模型的正确性。建立的模型与实验方法为预测激光器谐振腔失谐对激光器性能的影响提供了一种有效工具,为高可靠性激光器设计提供了依据。
The influence of laser resonator misalignment on laser performance was investigated theoretically and experimentally. In theory, based on the character of quasi-continuous diode-pumped electro-optical Q-switched solid-state laser, the rate equation model including the modifying function of cavity misalignment was set up. The influence of cavity misalignment on laser losses and laser performance was simulated with different laser modes, laser beam radius, radius of iris and position of iris and the influence of cavity misalignment on laser performance was simulated by model＇s numerical simulation. On the other hand, the influence of resonator misalignment on laser performance was measured in experiment. For the concave-convex cavity with cavity length of 250 mm and iris radius of 3.5 inm, the influence of concave mirror＇s misalignment on laser performance was more serious than that of the convex mirror＇s misalignment. The energy decreased from 220 mJ to 150.9 mJ corresponding to decreasing of 31.4% and pulse width increased from 5 ns to 6.5 ns with the concave mirror＇s misalignment angle increasing from 0 to 490 μrad. The experimental results and theoretical results are ingood agreement, indicating the validity of the laser model. The established laser model and the utilized experimental measuring method can be effective means to obtain the influence of resonator＇s misalignment on laser performance, which can be a reference of the design of high reliability laser.
出处
《红外与激光工程》
EI
CSCD
北大核心
2017年第6期19-25,共7页
Infrared and Laser Engineering
