| 高重复频率激光脉冲作用下KTP晶体中的灰迹 |
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| 引用本文： | 张秋慧,韩敬华,朱启华,谢旭东,朱建国,郑文琛,冯国英.高重复频率激光脉冲作用下KTP晶体中的灰迹[J].强激光与粒子束,2010,22(8). |
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| 作者姓名： | 张秋慧 韩敬华 朱启华 谢旭东 朱建国 郑文琛 冯国英 |
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| 作者单位： | 1． 四川大学 电子信息学院， 成都 610064；2． 中国工程物理研究院 激光聚变研究中心， 四川 绵阳 621900；3． 四川大学 材料科学与工程学院， 成都 610065 |
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| 基金项目： | 国家自然科学基金，固体激光国家级重点实验室基金 |
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| 摘 要： | 采用波长为1 064 nm/532 nm、脉宽6 ns(FWHM)的高重复频率调Q激光,研究了磷酸氧钛钾(KTP)晶体中灰迹的产生机理,以及色心密度对灰迹的影响。晶体透过率表征了色心密度,根据透过率与色心密度的关系以及色心密度对灰迹产生的决定作用,定义临界灰迹密度,当晶体透过率高于此值时可安全运行,而低于此值时,为避免晶体发生灾难性损伤应立即停止运行。实验结果表明:灰迹不仅大量吸收紫外及可见光能量,而且大量吸收近红外波段能量,这为灰迹的在线监测提供了一种监测方法。
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| 关 键 词： | KTP晶体 灰迹 色心 透过率 二次谐波 |
| 收稿时间： | 1900-01-01; |
Gray-tracking of KTP crystal under high rep-rate laser pulses |
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| Zhang Qiuhui,Han Jinghua,Zhu Qihua,Xie Xudong,Zhu Jianguo,Zheng Wenchen,Feng Guoying.Gray-tracking of KTP crystal under high rep-rate laser pulses[J].High Power Laser and Particle Beams,2010,22(8). |
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| Authors: | Zhang Qiuhui Han Jinghua Zhu Qihua Xie Xudong Zhu Jianguo Zheng Wenchen Feng Guoying |
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| Institution: | 1． College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China；2． Research Center of Laser Fusion, CAEP, P. O. Box 919-988, Mianyang 621900, China；3． College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China |
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| Abstract: | The mechanism of gray-tracking and the influence of color center on gray-tracking are studied for KTP crystal, with a Q-switched laser whose wavelength and pulse width are 1 064 nm/532 nm and 6 ns respectively. The transmittance of crystal represents color center density. According to the relation between the transmittance and color center and the decisive role of color center density on gray-tracking, the critical gray-tracking density is defined, above which safe operation can be ensured. The experimental results show that gray-tracking absorbs not only the energy of ultraviolet and visible lights, but also that of near infrared light, giving a method for monitoring gray-tracking on line. |
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| Keywords: | gray-tracking color center transmittance second harmonic |
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