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YCOB晶体生长与激光倍频性能研究

罗军1; 钱世雄2; 范世Ji1; 王锦昌1; 钟真武1; 徐家跃1   

  1. 1. 中国科学院上海硅酸盐研究所, 上海 200050; 2. 复旦大学物理系, 上海 200433
  • 收稿日期:2001-02-21 修回日期:2001-03-19 出版日期:2002-03-20 网络出版日期:2002-03-20

Research on Growth and Second-Harmonic Generation of YCOB Crystals

LUO Jun1; QIAN Shi-Xiong2; FAN Shi-Ji1; WANG Jin-Chang1; ZHONG Zhen-Wu1; XU Jia-Yue1   

  1. 1.; Shanghai Institute of Ceramics; Chiness Academy of Sciences; Shanghai 200050; China; 2. Department of Physics; Fudan University; Shanghai 200433; China
  • Received:2001-02-21 Revised:2001-03-19 Published:2002-03-20 Online:2002-03-20

摘要: 坩埚下降法沿<010>和<001>方向生长了直径达到25mm的完整透明的CaYO(BO (YCOB)晶体.化学腐蚀结果表明,所生长晶体无孪晶或亚晶界等缺陷,晶体尾部的位错密度 不超过1800/cm测量了YCOB的透射光谱,其截止波长为200nm进行了YCOB晶体对 Nd:YAG激光的二次倍频实验.通过与KDP晶体对比,计算出YCOB晶体的有效非线性系数 在Ⅰ型相位匹配方向(θ,φ)=(66.3°,143.5°)和(65.9°,36.5°)上分别为1.45pm/V和0.91pm/V; 大于KDP和 LBO晶体.在脉冲宽度10ns的 Nd:YAG激光单脉冲辐射下YCOB晶体出现体 损伤的激光损伤阈值不低于85GW/cm

关键词: YCOB, 晶体生长, 坩埚下降法, 二次倍频效应, 激光损伤阈值

Abstract: Crack-free and transparent Ca4YO(BO3)3 (YCOB) crystals with 25 mm diameter were grown by
the vertical Bridgman method in <010> and <001> directions. The results of chemical etching indicate that there are no sub-boundaries or twins
in the crystal, and the density of dislocations observed at top region of a crystal is less than 1800/cm2. The measured transmission spectrum
shows that the crystal has wide transmission range with absorption edge at 200nm. The SHG of a Nd:YAG laser was performed for YCOB crystals in
comparison with KDP crystal, the effective nonlinear coefficients (deff) of YCOB in type I phase matching directions of (θ, φ)=(66.3℃,
143.5℃) and (65.9℃, 36.5℃) were estimated to be 1.45pm/V and o.91pm/V respectively. The bulk damage threshold was observed as
85GW/cm2 for single pulse of a Nd:YAG laser with 10ns pulse duration.

Key words: YCOB, crystal growth, Bridgman method, second-harmonic generation, laser damage threshold

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