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通过建立激光介质非热平衡状态的振荡散热模型 ,分析了激光二极管抽运固体激光器中 ,热透镜的不稳定性 .研究表明 ,热透镜的这种热不稳定性是造成激光场不稳定的重要因素 .会造成高斯半径的不稳定波动 ,会使激光光束的指向角波动 ,会造成激光光斑的非对称畸变 ,这种畸变也处于波动之中 .通过对端面抽运条件下 ,热耗为 1W的Nd :YAG激光介质的理论和实验研究 ,确定了这种原因下光场不稳定度的数量级 .
The instability of thermal lens in laser diode pumped solid-state laser was analyzed by establishing the oscillating heat dissipation model of laser medium in non-thermal equilibrium state. The research shows that this thermal instability of thermal lens is an important factor that causes the instability of laser field Will cause the instability of Gaussian radius fluctuations, will make the laser beam pointing angle fluctuations, will cause the laser spot asymmetric distortion, this distortion is also fluctuating.After pumping the end face conditions, the heat loss of 1W The theoretical and experimental studies of Nd: YAG laser medium confirm the order of magnitude of the field instability for this reason.