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晶体面形畸变对三倍频转换效率的影响

郭怀文 周维 叶朗 独伟峰 谭宁 邓学伟 黄小霞 赵博望 钟伟 王芳

郭怀文, 周维, 叶朗, 等. 晶体面形畸变对三倍频转换效率的影响[J]. 强激光与粒子束, 2020, 32: 061002. doi: 10.11884/HPLPB202032.200046
引用本文: 郭怀文, 周维, 叶朗, 等. 晶体面形畸变对三倍频转换效率的影响[J]. 强激光与粒子束, 2020, 32: 061002. doi: 10.11884/HPLPB202032.200046
Guo Huaiwen, Zhou Wei, Ye Lang, et al. Effect of crystals’ surface shape distortion on conversion efficiency of third harmonic generation[J]. High Power Laser and Particle Beams, 2020, 32: 061002. doi: 10.11884/HPLPB202032.200046
Citation: Guo Huaiwen, Zhou Wei, Ye Lang, et al. Effect of crystals’ surface shape distortion on conversion efficiency of third harmonic generation[J]. High Power Laser and Particle Beams, 2020, 32: 061002. doi: 10.11884/HPLPB202032.200046

晶体面形畸变对三倍频转换效率的影响

doi: 10.11884/HPLPB202032.200046
基金项目: 国家自然科学基金项目(11704352,61775199,(61805223)
详细信息
    作者简介:

    郭怀文(1990-),男,助理研究员,从事高功率激光技术方面的研究;guohw09@163.com

    通讯作者:

    王 芳(1983-),女,硕士,副研究员,从事高功率固体激光技术和非线性光学研究;aimee_wf@163.com

  • 中图分类号: TN249

Effect of crystals’ surface shape distortion on conversion efficiency of third harmonic generation

  • 摘要: 在惯性约束聚变(ICF)领域,为了满足物理实验需求,需要采用短波长的紫外激光打靶。目前,国内外高功率固体激光装置普遍采用谐波转换的方式来获得三倍频紫外激光。高效的频率转换必须满足相位匹配条件,而晶体的反射面形畸变过大对准直精度和倍频效率均匀性都会产生不利影响。通过实验验证了晶体准直光斑的质量退化主要来源于晶体因夹持和重力导致的反射面形畸变,证明了改进晶体的夹持方式可以有效改善晶体面形,提高准直精度和准直光斑质量,并显著提升三倍频转换效率。
  • 图  1  I/II类三倍频方案

    Figure  1.  I/II type third harmonic generation

    图  2  三倍频效率与晶体失谐角的关系

    Figure  2.  Relationship between conversion efficiency of third harmonic generation and detuned angle of crystals

    图  3  失谐角与面形畸变及波前畸变的关系

    Figure  3.  Relationship between detuned angle and surface shape distortion,between detuned angle and wavefront distortion

    图  4  高功率激光装置光路

    Figure  4.  Beampath of the high power laser facility

    图  5  三倍频晶体返回光斑

    Figure  5.  Return light spots of THG

    图  6  铝镜返回光斑

    Figure  6.  Return light spot of aluminum film reflector

    图  7  晶体面形

    Figure  7.  Measurement results of surface shape of crystals

    图  8  改善后的晶体返回光斑

    Figure  8.  Return light spots of crystals after improvement

    图  9  某光路三倍频晶体返回光斑

    Figure  9.  Return light spots of THG of a beam

    图  10  某光路三倍频效率

    Figure  10.  Conversion efficiency of third harmonic generation of a beam

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出版历程
  • 收稿日期:  2020-02-25
  • 修回日期:  2020-04-19
  • 刊出日期:  2020-06-01

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