论文部分内容阅读
激光二极管阵列(LDA)的出射光束空间分布不均匀,发散角大,难以直接用于端面抽运的固体激光器中,需要对LDA输出光束进行整形耦合。用Zemax光学设计软件设计出一款适合端面抽运全固态激光器的耦合系统,该耦合系统由快轴准直镜与透镜导管组成。着重研究了透镜导管的耦合效率与透镜导管特征参数之间的关系,并通过光线追迹得出最佳耦合系统参数。设计的透镜导管长22 mm,输入面尺寸为12 mm(快轴)×9 mm(慢轴),输出面尺寸为3.5 mm×3.5 mm,输入端球面曲率半径为14 mm。该系统耦合效率可达90.7%,距输出端1 mm处的光束发散角为0.38 mrad(快轴)与0.02 mrad(慢轴),可使抽运光和固体激光器振荡光达到良好的光束匹配效果。
The output beam of laser diode array (LDA) is spatially unevenly distributed and has a large divergence angle. Therefore, it is difficult to directly apply the output beam of the LDA to a solid-state laser with an end-pumped laser. The LDA output beam needs to be shaped and coupled. A Zemax optical design software is used to design a coupling system for an end-pumped solid-state laser. The coupling system consists of a fast axis collimator and a lens tube. The relationship between the coupling efficiency of the lens catheter and the characteristic parameters of the lens catheter is emphatically studied, and the optimum coupling system parameters are obtained by ray tracing. The designed lens catheter has a length of 22 mm, an input face size of 12 mm (fast axis) × 9 mm (slow axis), an output face size of 3.5 mm × 3.5 mm and an input spherical radius of curvature of 14 mm. The system achieves a coupling efficiency of 90.7% and a beam divergence of 0.38 mrad (fast axis) and 0.02 mrad (slow axis) at 1 mm from the output for good beam matching of pump light and solid laser oscillation light .