强激光与粒子束, 2010, 22 (2): 323, 网络出版: 2010-05-28   

不同波长三倍频DKDP晶体的激光损伤

Laser-induced damage of DKDP crystal for third harmonic generation under different wavelengths
作者单位
1 山东大学 晶体材料国家重点实验室,济南 250100
2 中国工程物理研究院 上海激光等离子体研究所,上海201800
3 中国科学院 上海光学精密机械研究所,上海 201800
摘要
采用传统降温法,利用高纯原料从氘化程度为80%的溶液生长了四方相磷酸二氘钾(DKDP)晶体,并按Ⅱ类三倍频方式切割晶体。三倍频用DKDP晶体的最大问题在于其抗光伤阈值低于KDP晶体,严重限制了激光输出的能量密度和晶体使用寿命。考察了不同波长下三倍频DKDP晶体的损伤阈值,以及激光退火效应。实验表明,激光退火对于DKDP晶体的损伤阈值有显著的提升作用,基频、倍频、三倍频的提升效果分别达到1.4,1.9,2.7倍,是改善DKDP晶体抗光伤能力的有效途径。
Abstract
DKDP crystal was grown from 80%-deuterated solution of high pure materials and the crystal was cut to type Ⅱ tripler sample. The major problem of DKDP crystal for third harmonic generation (THG) is its low laser-induced damage thres-hold with respect to KDP,which greatly limits energy fluence of output laser and crystals’ life. Laser-induced damage thres-hold of DKDP crystal for THG was measured under different wavelengths and the effect of laser annealing was also investigated. The experiment shows that laser annealing could obviously improve laser-induced damage threshold of DKDP crystal. The thres-hold is improved to 1.4,1.9 or 2.7 times that before annealing for fundamental,second or third harmonic,respectively. Thus laser annealing is an effective approach to enhance laser-induced damage resistance of DKDP crystal.
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刘宝安, 孙绍涛, 季来林, 赵元安, 胡国行, 徐明霞, 高慧, 王正平, 孙洵, 许心光. 不同波长三倍频DKDP晶体的激光损伤[J]. 强激光与粒子束, 2010, 22(2): 323. Liu Baoan, Sun Shaotao, Ji Lailin, Zhao Yuan’an, Hu Guoxing, Xu Mingxia, Gao Hui, Wang Zhengping, Sun Xun, Xu Xinguang. Laser-induced damage of DKDP crystal for third harmonic generation under different wavelengths[J]. High Power Laser and Particle Beams, 2010, 22(2): 323.

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