梯度浓度掺杂复合板条抽运分布均匀性的分析

为了提高板条介质内抽运分布的均匀性,基于LD双端抽运Nd:YAG陶瓷板条放大器设计方案,理论分析了端面抽运条件下,单一浓度掺杂和梯度浓度掺杂板条介质吸收的抽运功率密度分布情况。通过分析可知,对于单一浓度掺杂板条,会产生抽运效率与抽运吸收功率均匀性之间的相互制约问题,而采用梯度浓度掺杂板条介质,在较高的抽收效率情况下,抽运吸收功率分布更加均匀。结果表明,采用梯度浓度掺杂结构可以提高板条介质内抽运分布的均匀性。

Theoretical analysis of pumping homogeneity in gradient dopant concentration composite slab

In order to improve the homogeneity of pumping power in the slab, based on the designing scheme of LD dual-end-pumped Nd∶YAG ceramic slab laser, the absorbed pump power density distribution of constant concentration dopant slab and gradient concentration dopant slab were theoretically analyzed respectively. After analysis, it is found that the pump absorption intensity distribution becomes non-uniform for constant concentration dopant slab when the pump absorption efficiency is improved. However, for gradient concentration dopant slab, high pumping efficiency and uniform pump absorption intensity distribution can be separately achieved, which can improve the homogeneity of pumping power absorbed in the slab.