梯度掺杂Yb∶YAG重频激光器热管理研究

Thermal-management of grad-doping Yb:YAG repetitive-rate laser

为了改善重频激光器的热性能,本文采用了键合Yb:YAG晶体薄片作为激光增益介质,介质中掺杂粒子浓度呈梯度分布.文章计算了不同参数条件下介质抽运过程,得到介质内部的储能,温度和应力分布,并从中选出较为优化的介质参数.计算表明,采用梯度掺杂的方法,介质温度降低,形变和热应力减小,波前畸变改善.理论上证明了采用梯度掺杂的方法改善热管理的可行性.

To improve thermal capability of repetitive-rate laser,in this paper bonded Yb：YAG slices are chosen as gain medium,the doping-concentration in gain medium in chosen to be distributed in gradient manner.The distributions of stored energy,temperature and stress are obtained by calculating pumping process inside gain medium.From among the obtained results optimal parameters are chosen for an optimized design.The calculation indicate that using grad-doping medium can reduce temperature,deform,stress and wave aberration.In this paper,the feasibility of improving thermalmanagement by using grad-doping medium is demonstrated theoretically.