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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。
Theoretical and experimental study of the laser resonator detuning on the laser performance. On the one hand, in theory, based on the characteristics of quasi-continuous diode-pumped and electro-optical Q-switched solid-state lasers, a rate equation model including the detuning correction function of the resonator is established. Through the numerical simulation, the effects of different laser modes, spot radius, aperture radius and orifice position on laser loss and laser performance are simulated. On the other hand, the effect of resonator detuning on laser performance is experimentally measured. For the concave and convex unstable cavity with a length of 250 mm and a minimum aperture of 3.5 mm, the misalignment of the concave omnidirectional mirror and the convex output mirror has a great effect on the performance of the laser. When the horizontal misalignment angle of the concave omnidirectional mirror increases from 0 to At 490μrad, the laser energy decreases from 220 m J to 150.9 m J, down 31.4%, and the pulse width increases from 5 ns to 6.5 ns. The experimental results agree well with the theoretical analysis, which shows that the laser model is correct. The established model and experimental method provide an effective tool for predicting the influence of laser resonator detuning on laser performance, and provide the basis for the design of highly reliable laser.