采用大口径、高功率激光二极管(LD)阵列的大型全固化二极管抽运激光系统(DPSSLs)能够产生高功率、大能量、高重复频率的优良激光。为了实现对介质的高效抽运,将空心透镜导管应用于大口径高功率激光二极管阵列耦合系统。基于三维光线追迹的数值计算方法,编制了LD纵向抽运耦合系统模拟软件,对空心透镜导管进行模拟与设计,使系统耦合效率超过90%的同时,增益介质表面抽运场具有良好的均匀性,实现了对介质的高效均匀抽运;同时通过改变空心透镜导管的参数进行模拟比较,得出了空心透镜导管设计的经验公式,为大型DPSSLs耦合系统的设计提供了有益的参考。

The hollow lens duct is introduced for the application in the coupling of pump radiation from extended two-dimensional semiconductor laser diode arrays into solid state laser gain media. With the help of numerical analysis of three-dimension ray tracing, a computer simulation program for longitudinal-pump laser diode (LD) coupling system was developed. Based on the result of simulation, a coupling system for large-aperture high-power LD arrays using hollow lens duct was build. Coupling efficiency beyond 90% was reached with perfect pumping-uniformity on the surface of gain material. An experience formula for hollow lens duct design was deduced at the same time, it would be very helpful in designing coupling system of large-scale diode-pumped solid-state lasers (DPSSLs).