摘要
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5.8×104J、抽运重复频率为2Hz和抽运脉冲能量为3.2×104J、重复频率为10Hz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10s内和60s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:glass slab pumped with two different pumping levels, the parameters are 58 kJ of pumping pulse energy, 2 Hz and 32 kJ of pumping energy, 10 Hz, respectively. Analyzing and comparing the result show that the slab laser with this pumping structure can work like heat capacity laser in short time with high average power output and good beam quality.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2004年第12期1658-1662,共5页
Acta Optica Sinica
关键词
激光技术
双板条增益介质
瞬态温度分布
热传导方程
热传导方程
laser technique
double gain media slab
transient temperature distribution
heat conduction equation
heat conduction equation
