| 离散效应对高强度激光三次谐波转换的影响 |
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| 引用本文： | 赵华君,冯国英,朱启华,张清泉,陈建国. 离散效应对高强度激光三次谐波转换的影响[J]. 强激光与粒子束, 2004, 16(10): 1277-1280 |
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| 作者姓名： | 赵华君 冯国英 朱启华 张清泉 陈建国 |
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| 作者单位： | 1．四川大学 电子信息学院， 四川 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 |
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| 基金项目： | 中国工程物理研究院 国家自然科学基金委联合基金资助课题(10176019) |
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| 摘 要： | 使用分步傅里叶变换和四阶龙格库塔法(R-K) ，对高强度激光以Ⅰ/Ⅱ类角度失谐方式，在KDP晶体中的谐波转换进行了研究，详细讨论了离散效应对三次谐波转换的影响。结果表明，离散效应不但降低了三次谐波转换效率，而且使谐波光束质量显著降低；初始入射基频光束腰半径较小时，离散效应是二次谐波转换和三次谐波转换效率降低的主要因素，失谐角对三次谐波转换的影响较小；随着束腰半径的增加，离散效应的影响逐渐减小，失谐角对三次谐波转换的影响逐渐增加。
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| 关 键 词： | 离散效应 三次谐波转换 高斯光束 KDP晶体 |
| 文章编号： | 1001-4322(2004)10-1277-04 |
| 收稿时间： | 2004-03-29 |
| 修稿时间： | 2004-03-29 |
Walk-off in the third harmonic generation |
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| ZHAO Hua-jun,FENG Guo-ying,ZHU Qi-hua,ZHANG Qing-quan,CHEN Jian-guo. Walk-off in the third harmonic generation[J]. High Power Laser and Particle Beams, 2004, 16(10): 1277-1280 |
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| Authors: | ZHAO Hua-jun FENG Guo-ying ZHU Qi-hua ZHANG Qing-quan CHEN Jian-guo |
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| Affiliation: | 1. School of Ｅlectronics and Information, Sichuan University, Chengdu 610064，China；2. Research Center of Laser Fusion，CAEP, P.O. Box 919 988, Mianyang 621900, China |
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| Abstract: | The third harmonic conversion of type I/ type II angle-detuning scheme of KDP has been studied. And the effects of the walk-off in the third harmonic generation was investigated. A split-step algorithm based on the Fast Fourier Transform and a Runge-Kutta integrator is used. As a result, the walk-off decreased not only the tripling efficiency but also the harmonic beams quality. When the waist radius of the fundamental wave is small, the walk-off is the main factor that makes the SHG and THG conversion efficiency decrease, while the effect of detuning angle is little. As the waist radius of the fundamental wave increases, the effect of the walk-off slowly reduces and the effect of detuning angle increases. |
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| Keywords: | Walk-off Third harmonic generation Gaussian beam KDP crystal |
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