拍瓦级激光参数测量中脉宽测量可靠性分析

发布时间：2018-01-07 00:17

本文关键词：拍瓦级激光参数测量中脉宽测量可靠性分析　出处：《中国激光》2017年11期 　论文类型：期刊论文

【摘要】：高能拍瓦激光的高精度脉宽测量对离轴抛物面镜焦斑功率密度的诊断以及光栅损伤阈值的分析都具有重要意义。分析了光束指向性和近场分布的周期性调制这两方面的误差影响。结果表明,当反射镜稳定性在5μrad时,光束指向性的误差最大为0.03%。当近场调制周期增加时,误差降低;而调制度增加时,误差增大。另外,采用镜像结构能降低近场缺陷导致的测量误差。当调制深度为1.5、调制周期大于10时,综合误差小于20%,最小可降至10%。镜像结构的误差均小于15%,最小可降至0。在拍瓦级激光脉宽测量实验中,证实了近场调制对于脉宽测量的影响及改善效果。
[Abstract]:High energy petawatt laser high precision pulse width measurement is of great significance to the diagnosis analysis of off axis parabolic mirror focal power density and grating damage threshold were analyzed. Influence of beam pointing error and near field distribution of the periodic modulation of the two aspects. The results show that when the mirror stability at 5 rad, the beam directivity error is 0.03%. when the near-field modulation period increases, the error is reduced; and the modulation increases, the error increased. In addition, the mirror structure can reduce the measurement error due to near field defects. When the modulation depth is 1.5, the modulation period is greater than 10, the comprehensive error is less than 20%, the minimum error to the 10%. image structure is less than 15%, the minimum fell to 0. in the petawatt level laser pulse width measurement in the experiment confirmed the effect of pulse width modulation for the near-field measurement and improvement.

【作者单位】：中国科学院上海光学精密机械研究所;中国科学院大学;
【基金】：国家重点研发计划(2016YFA0401102)
【分类号】：TN247
【正文快照】： 1　引　　言高能拍瓦激光为激光物质相互作用的研究工作提供了一个重要的技术手段,在高能密度物理研究、惯性约束聚变(ICF)、快点火、先进射线能力(ARC)等领域具有重要的应用价值[1-3]。国内外有许多已建成或在建的高能超短脉冲激光装置[4-5]。美国罗切斯特大学研制的OMEGA

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