二极管侧面泵浦薄片激光器泵浦性能数值仿真

Numerical simulation of pumping performance of diode side pumped thin disk laser

利用二极管侧面泵浦薄片激光器泵浦分布的对称性,通过泵浦分布中的特殊点对泵浦均匀性进行定量描述的方法,提出了由泵浦均匀性和吸收效率共同表征的泵浦性能指标,并使用该指标对一定范围内的阵列距离、圆薄片晶体尺寸和吸收系数的泵浦性能进行了对比。在一定取值范围内,当圆薄片晶体半径为13 mm、阵列与晶体中心间距为37 mm、吸收系数为0.10 mm-1时,泵浦性能指标达到最小值0.111 0。采用接近最优泵浦性能指标值的泵浦参数进行实验,初步测量了热效应造成的薄片相位畸变,根据泵浦分布计算出的相位畸变分布与实验结果基本相符。文中提出的泵浦性能指标和相应计算结果为薄片激光器的优化设计提供了理论参考。

Taking advantage of the symmetry in the distribution of the absorbed pump power density of a diode side pumped thin disk laser,the pump uniformity could be described quantitively with a novel method that took values on key points of absorbed pump power density distribution into consideration.A pump performance index that considered both pump uniformity and absorption efficiency was introduced.Pump performance index within certain ranges of diode array distance,round thin disk radius and absorption coefficient were compared.Results of calculation show that the performance index reaches an optimized minimum of 0.111 0 with the round thin disk radius of 13 mm,the diode array distance of 37 mm,and the absorption coefficient of 0.10 mm-1.A performance index near to the optimized value could be obtained with the parameters experimentally used.Tentative experiment measured the phase distortion on the thin disk caused by thermal effects.The computed phase distortion matches with experimentally measured phase distortion.Pump performance index and related calculation results presented in this paper presents a useful theoretical reference for research of diode side pumped composite thin disk lasers.