为了实现薄片激光器高吸收转换效率的目的,采用多次抽运吸收的方式,结合光斑离轴非对称反射抛物面和光斑对称分布非球面的抽运结构,提出了一种可以提高非球面光束分布占空比的高冲程抽运的新方法。设计了多种不同抽运冲程的结构,使用ZEMAX模拟验证了24冲程抽运时的光路分布和光斑位置图,通过比尔吸收定律理论计算了不同抽运冲程下薄片晶体对抽运光的吸收效率。结果表明,所设计的24冲程、36冲程、40冲程和80冲程的抽运结构,其中36冲程的吸收效率的性价比最高。该研究对高功率、高冲程、小体积的抽运结构设计具有指导作用。

In order to achieve high absorption and conversion efficiency of thin disk lasers, the method of multiple pumping absorptions was adopted. Combining with the pumping structure of light spot asymmetric parabolic surface and light spot symmetrical aspheric surface, a new method of high pumping passing was proposed to improve the duty ratio of aspheric beam distribution. The multipass pumping structure was designed. The optical path distribution and spot position diagram of 24 passes pumping schemes were simulated by using ZEMAX. Absorption efficiency of thin disk crystal on pump light with different pumping passes was calculated theoretically according to Bill’s absorption law. The results show that among the designed pump structures of 24 passes, 36 passes, 40 passes and 80 passes schemes, the absorption efficiency of 36 passes pumping scheme is the most cost-effective. The research has guiding function for the design of small multi-pass pumping structures with high power.