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深入研究了随机激光等效腔的局域化特性,引入了外部光反馈下激光器的理论分析速率方程,设计了磁旋光晶体的光隔离器件实现随机激光器的改进。采用的Nd:YAG激光器的实验结果验证了改进激光器可以降低散射损耗,实现紫外激光的方向性输出。FDTD仿真结果进一步表明波导的TE模的光增益近似是平面波导的两倍;信号和泵浦强度的耦合在改进波导结构有了明显改进;输出功率结果证实了结构降低随机激光器的散射损耗。研究结果对于随机激光的应用具有明显的参考价值。
The localization characteristics of stochastic laser cavity are deeply studied. The theoretical analysis rate equation of laser with external optical feedback is introduced, and the optical isolation device with magneto-optical crystal is designed to realize the improvement of stochastic laser. The experimental results of the Nd: YAG laser verified that the improved laser can reduce the scattering loss and achieve the directional output of UV laser. The results of FDTD simulation further show that the optical gain of the TE mode waveguide is approximately twice that of the planar waveguide. The coupling of signal and pump intensity has been improved obviously. The output power results show that the structure reduces the scattering loss of the random lasers. The research results have obvious reference value for the application of stochastic laser.