Measurement of Raman scattering gain coefficient in large-aperture DKDP crystals irradiated by 351 nm pulses
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摘要: 大口径KDP/DKDP晶体在强紫外光辐照下产生横向受激拉曼散射效应（TSRS）, 受激放大的拉曼散射光将导致激光能量损失甚至激光损伤, 测量DKDP晶体TSRS增益系数对设置激光装置的运行区间以确保晶体的安全使用非常重要。采用高精度光谱仪探测大口径DKDP晶体（氘含量65%）在351 nm激光辐照下的横向拉曼散射信号, 得到了拉曼散射光的增长曲线, 拟合得到的拉曼增益系数为0.109 cm/GW。同时, 实验结果表明晶体体损伤不影响TSRS增长行为, 表明晶体体损伤对拉曼增益系数测量结果的影响可以忽略。Abstract: Transverse stimulated Raman scattering (TSRS) gain coefficient in a large aperture 65% deuterated potassium dihydrogen phosphate (DKDP) is measured at 351 nm. The measurement involves the use of an optical fiber sensor system to detect Raman scattering light in the DKDP crystal. A Raman scattering gain coefficient of 0.109 cm/GW is obtained and will be used to set upper limit of the DKDP crystals in our laser facility to avoid the TSRS induced energy loss and laser damage. The effect of bulk damage on growth behavior of TSRS is also examined and it is found that bulk damage has little impact on the TSRS growth. Thus the influence of bulk damage on the measurement of TSRS gain coefficient can be ignored.
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