| 脉冲形状对3次谐波转换的影响分析 |
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| 引用本文： | 韩伟,钟伟,李富全,向勇,王礼全,李恪宇,贾怀庭,冯斌.脉冲形状对3次谐波转换的影响分析[J].激光技术,2008,32(5):471-473,557. |
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| 作者姓名： | 韩伟 钟伟 李富全 向勇 王礼全 李恪宇 贾怀庭 冯斌 |
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| 作者单位： | 中国工程物理研究院,激光聚变研究中心,绵阳,621900 |
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| 摘 要： | 为了使谐波转换系统保持高效稳定的3次谐波转换,采用数值模拟的方法,研究了基频光脉冲波形对3倍频转换效率的影响,并对高斯脉冲和平顶脉冲的不同谐波转换特点作了详细分析.当基频光为高斯脉冲时,在3GW/cm2的输入条件下最佳的2倍频转换效率为56.8%,低于理论预计的66.7%.进一步计算了不同功率密度下,最佳2倍频转换效率与超高斯脉冲阶数的关系.当考虑空间走离效应,基频光时间和空间均为平顶分布时,最佳的2倍频转换效率为62%;若基频光时间为平顶分布、空间分布为高斯分布时,最佳2倍频转换效率为51%,进一步地偏离66.7%.结果表明,当基频光脉冲形状偏离理想的平顶分布时,适当地降低2倍频转换效率,可提高3倍频转换效率.
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| 关 键 词： | 非线性光学 3次谐波转换 高斯脉冲 转换效率 |
| 收稿时间： | 2007/4/29 |
Influence of fundamental pulse shape on third-harmonic generation |
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| HAN Wei,ZHONG Wei,LI Fu-quan,XIANG Yong,WANG Li-quan,LI Ke-yu,JIA Huai-ting,FENG Bin.Influence of fundamental pulse shape on third-harmonic generation[J].Laser Technology,2008,32(5):471-473,557. |
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| Authors: | HAN Wei ZHONG Wei LI Fu-quan XIANG Yong WANG Li-quan LI Ke-yu JIA Huai-ting FENG Bin |
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| Affiliation: | HAN Wei,ZHONG Wei,LI Fu-quan,XIANG Yong,WANG Li-quan,LI Ke-yu,JIA Huai-ting,FENG Bin(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China) |
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| Abstract: | In order to achieve stable and high conversion efficiency,the influence of fundamental pulse shape on third-harmonic generation was analyzed and different physical insights of third-harmonic conversion with flat-top pulse and Gaussian pulse were studied respectively.In the case of Gaussian fundamental pulse and 3GW/cm2 input intensity,the calculated optimal second-harmonic conversion efficiency was 56.8%,lower than 66.7% predicated in theory.Furthermore,the dependence of optimal second-harmonic conversion e... |
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| Keywords: | nonlinear optics third-harmonic conversion Gaussian pulse conversion efficiency |
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