| 平顶高斯超短脉冲激光的时间部分相干性对相干合成的影响 |
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| 引用本文： | 杨雨川,罗晖,景峰,李富全,王逍,黄小军,冯斌.平顶高斯超短脉冲激光的时间部分相干性对相干合成的影响[J].强激光与粒子束,2011,23(2). |
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| 作者姓名： | 杨雨川 罗晖 景峰 李富全 王逍 黄小军 冯斌 |
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| 作者单位： | 1. 国防科学技术大学 光电科学与工程学院, 长沙 410073;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： | 国家高技术发展计划项目，中国工程物理研究院激光聚变研究中心创新基金 |
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| 摘 要： | 利用准单色光干涉理论，计算了2×2平顶高斯超短脉冲激光在远场的干涉图样，分析了激光的时间部分相干性及其存在束间相位差时对相干合成的影响。计算结果表明，当单路激光输出光束线宽小于100 nm时，理想波前的远场光斑图样和峰值光强基本保持不变，当光束线宽大于100 nm时，干涉减弱衍射效应逐渐增强；光束间存在相位差时，时间部分相干性将破坏远场图样随束间相位差的周期性变化，相位差越大干涉越弱；当超过相干长度时，则为非相干合成，但1/6倍相干长度范围内,仍可视为较理想的相干合成，此时焦斑的斯特列尔比大于0.9，对超短脉冲的相干合成影响可忽略。
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| 关 键 词： | 超短脉冲 相干合成 脉冲宽度 束间相位差 远场图样 |
| 收稿时间： | 1900-01-01; |
Effect of temporal partial coherence of flat-topped Gauss ultrashort-pulse lasers on coherent combination |
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| Yang Yuchuan,Luo Hui,Jing Feng,Li Fuquan,Wang Xiao,Huang Xiaojun,Feng Bin.Effect of temporal partial coherence of flat-topped Gauss ultrashort-pulse lasers on coherent combination[J].High Power Laser and Particle Beams,2011,23(2). |
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| Authors: | Yang Yuchuan Luo Hui Jing Feng Li Fuquan Wang Xiao Huang Xiaojun Feng Bin |
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| Institution: | 1. College of Opto-Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. Research Center of Laser Fusion, CAEP, P. O. Box 919-988, Mianyang 621900, China |
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| Abstract: | Using quasi-monochromatic light interference theory, the far-field interference pattern is calculated for the combination of 2×2 flat-topped Gauss ultrashort-pulse lasers, and the effect of phase difference (PD) and temporal partial coherence on coherent combination is discussed. The results show that when the line-width of the beams is less than 100 nm, the far-field pattern and peak light intensity hardly change for ideal wavefront; when the line-width is more than 100 nm, the interference effect weakens gradually. With phase difference, the periodic variation of far-field pattern will be destroyed by temporal partial coherence, and the interference effect gradually becomes weak as the increment of PD. Incoherent combination appears for PD beyond coherent length, while the combination c |
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| Keywords: | ultra-short pulse coherent combination pulse width phase difference far-field pattern |
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