提出一种新的激光增益介质板条抽运结构,这种结构能对由激光增益介质板条温度分布不均所造成的波面热畸变实现自校正,并建立了这种抽运结构下激光增益介质板条的瞬态温度分布理论模型,通过解热传导方程,推导出板条增益介质的瞬态温度分布的解析表达式。同时对抽运参量分别为抽运脉冲能量为5.8×104 J、抽运重复频率为2 Hz和抽运脉冲能量为3.2×104 J、重复频率为10 Hz两种情况下两种下N-31型钕玻璃板条的瞬态温度分布分别进行了数值计算,分别给出两种情况下10 s内和60 s时钕玻璃板条的温度分布图并对结果进行了分析和对比,表明采用这种抽运结构的增益介质板条激光器可以以类似热容激光器的方式在短时间内实现高平均功率、高光束质量运转。

A new pumping structure of laser gain media slab is proposed, the thermal wavefront distortion caused by the non-uniform temperature distribution of the laser gain media slab will be self-corrected in this structure, and the theoretical model of the transient temperature distribution is established to describe the pumping structure, the analytic expression of the transient temperature distribution of the laser gain media slab is derived from heat conduction equations. Numerical simulations of the temperature distribution within 10 seconds and at 60 seconds are given for N-31 Nd