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为了实现薄片激光器高吸收转换效率的目的,采用了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,抽运冲程为36时,其吸收效率的性价比最高。
In order to achieve the high absorption conversion efficiency of the thin-film lasers, a multi-pumping method is adopted. Combining with the asymmetric reflection off-axis paraboloid and the symmetrical aspheric pumping structure, a new method is proposed to increase the aspheric beam distribution Duty cycle high-stroke pumping new method. A series of structures with different pumping strokes are designed. The optical path distribution and spot location map of 24-stroke pumping are validated by Zemax simulation. The absorption efficiency of pumping light at different pumping strokes is calculated by the theory of Beer’s law of absorption . The results show that when the pumping stroke is 36, its absorption efficiency is the best.