一种具有大通光孔的碟片多程泵浦结构

A thin-disk multi-pass pump scheme with large laser aperture

提出了一种基于4-f成像的新型碟片多程泵浦方案。该方案由一片大抛物镜和两组转折棱镜组成多程泵浦的基本传输结构。这种方案拥有0~90°的理论通光孔径角,比目前常见的泵浦结构方案的通光孔径角范围都更宽。在该方案中,碟片上的泵浦光斑具有良好的重合性和锐利的边缘。该泵浦结构在注入344 W、18次泵浦的条件下实现了141 W的多模激光输出,光-光转换效率达到41%,斜率效率接近50%。

In this paper,a novel multi-pass pump scheme based on 4-f imaging is proposed.The scheme consists of a large parabolic mirror and two groups of folding prisms,which are the basic propagation structure of the scheme.The pump scheme has a theoretical aperture of 0−90°for laser transmission,which is wider than that of the commonly used pump schemes.The pump spot on the disk in the pump scheme has a good coincidence with sharp edges.With 344 W power injection and 18 times pumping,an average output of 141 W multi-mode laser is achieved.The optical to optical efficiency reaches 41%,and the slope efficiency is close to 50%.