中红外ZBLAN光纤拉曼激光器的理论分析与设计

Theoretical analysis and design of mid-infrared ZBLAN fiber Raman laser

根据ZBALN光纤拉曼激光器的结构,理论分析了中红外ZBLAN光纤级联拉曼激光器运行方式并建立了泵浦光和斯托克斯光的非线性耦合方程组。基于该方程组,对用高功率掺铥光纤激光器泵浦ZBLAN光纤产生拉曼频移时泵浦光和斯托克斯光在光纤中的演化过程进行了仿真。为了提高激光器性能,对光纤长度、输出耦合器反射率、泵浦功率等激光器参数及其对激光器性能的影响进行了数值分析。数值计算结果表明,用掺铥光纤激光器泵浦ZBLAN光纤可以以较高的光光转换效率产生更长波长的拉曼激光。不同的光纤长度和输出耦合器反射率相互影响,并共同影响激光器的性能。根据以上分析,最终获得了高性能的ZBLAN光纤拉曼激光器的优化参数。

According to the ZBLAN fiber Raman laser structure of mid-infrared ZBLAN fiber Raman laser, was theoretically analyzed and the nonlinear coupling the operation mode of equations between the pump and Stokes light were constructed. Based on the equations, the evolution of the pump and Stokes light in ZBLAN fiber pumped by Tm-doped fiber laser was simulated. In order to achieve better performance, the effects of parameters of ZBLAN fiber Raman laser including fiber length, reflectivity of output coupler and pump power on the performance of laser were numerically analyzed. The results show that high power long wavelength Raman laser can be generated with higher optical to optical conversion efficiency by ZBLAN fiber pumped by Tm-doped fiber laser. The fiber length and reflectivity of output coupler influence each other, and affect the laser performance together. Based on the above analysis, the optimized parameters of ZBLAN fiber Raman laser are obtained finally.