中国激光, 2016, 43(3): 0306001, 网络出版: 2016-03-01

大口径N31 钕玻璃片高增益情况下热性能研究

Investigation on Thermal Effect of N31 Neodymium Glass in High Gain Performance
作者单位

1中国科学院大学, 北京 100049

2中国科学院上海光学精密机械研究所高功率激光单元技术研发中心, 上海 201815

3中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900

4中国科学院上海光学精密机械研究所高密度光存储技术实验室, 上海 201800

摘要
大口径高通量验证实验平台(以下简称ITB 装置)是我国为开展惯性约束聚变(ICF)研究而研制的激光装置,单束输出能量达到了19.6 kJ(基频发射波长为1053 nm,脉宽为5 ns)。对大口径N31钕玻璃片在ITB 装置400 mm×400mm 单口径片状放大器系统上应用的热特性进行了实验研究,结果表明:在增益系数为5.28% cm-1高增益情况下,整个激光链路热致动态波前畸变峰谷值dPV 约为5.3 λ,处于变形镜校正范围之内;结合合理设计冷却方案,剩余波前畸变恢复时间约为2.5 h,满足了系统运行发次间隔为4 h的设计要求。
Abstract
The integration-test-bed (ITB) device is established for research on inertial confinement fusion(ICF) in China. The single-beam output energy reaches 19.6 kJ successfully when the fundamental frequency emission wavelength is 1053 nm and the pulsewidth is 5 ns. Experimental results of thermal effect of 400 mm × 400 mm aperture slab amplifiers in ITB devices show that the peak-to-valley value dPV of pump-induced wave-distortion of the whole laser chain is about 5.3 l, in the revise extension of deformable mirror, when the gain coefficient is 5.28% cm-1. Combined with the optimizations of heat management, the thermal recovery time is about 2.5 h, which can satisfy the requirement of 4 h/shot.
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