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Tm:YAG晶体以其优越的特性在产生2μm激光方面得到广泛应用。基于Tm:YAG激光器准三能级系统,建立了激光二极管(LD)侧面抽运Tm:YAG激光器抽运阈值的理论模型,并对不同振荡模式下的抽运阈值进行数值模拟。结果表明,通过改变输出耦合率可以实现Tm:YAG激光器输出波长在2.02μm和2.07μm波长的调控。在输出镜耦合率小于8.07%时,具有较大发射截面的2.02μm振荡模式被具有较小重吸收损耗的2.07μm振荡模式所抑制,从而实现高功率全固态LD侧面抽运2.07μm波长的Tm:YAG激光器。并搭建了侧面抽运Tm:YAG激光器系统进行实验验证。结果表明,实验结果和理论预测完全一致。
Tm: YAG crystals have been widely used to produce 2μm laser with its superior characteristics. Based on the quasi - three - level system of Tm: YAG laser, a theoretical model of the pumping threshold of the laser diode (LD) side - pumping Tm: YAG laser was established and the pumping threshold under different oscillation modes was numerically simulated. The results show that the output wavelength of Tm: YAG laser can be controlled at 2.02μm and 2.07μm by changing the output coupling ratio. At a coupling ratio of the output mirror of less than 8.07%, the 2.02μm oscillation mode with the larger emission cross section is suppressed by the 2.07μm oscillation mode with the smaller re-absorption loss to achieve high power all-solid-state LD side-pumping Tm with 2.07μm wavelength YAG laser. And set up a side pumping Tm: YAG laser system for experimental verification. The results show that the experimental results and theoretical predictions are exactly the same.