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不同22集束聚焦方式下高功率激光靶面光强分布特性

孙晓艳 雷泽民 卢兴强 吕风年 张臻 范滇元

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不同22集束聚焦方式下高功率激光靶面光强分布特性

孙晓艳, 雷泽民, 卢兴强, 吕风年, 张臻, 范滇元

Light intensity distribution of high-power laser beams on target plane under different focus system of 22 beam array

Sun Xiao-Yan, Lei Ze-Min, Lu Xing-Qiang, Lü Feng-Nian, Zhang Zhen, Fan Dian-Yuan
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  • 大口径高功率激光装置为提高激光靶面的光强强度, 通常采用22集束聚焦的模式进行打靶. 大口径楔形透镜是组成22集束聚焦系统的核心元件, 可分为二维离轴楔形透镜、一维离轴楔形透镜和非离轴楔形透镜3类. 为了获得理想靶面光强分布, 基于这3 类楔形透镜, 对比研究相应22集束聚焦系统下的靶面光强分布特性. 研究结果表明: 相比离轴楔形透镜, 采用基于非离轴楔形透镜的22集束聚焦系统时, 容易在激光靶面获得更窄的主瓣宽度、更强的峰值强度、更高的能量集中度. 研究结果对高功率激光靶场聚焦系统的配置选择有重要参考价值.
    Large aperture high-power laser drivers usually focus the high power laser beams in 22 quads to the target chamber center in order to increase the light intensity on the target plane. The large aperture wedged focus lenses are the core components in the focus system of quadruplets of beams, and it is thought possible to use four two-dimensional off-axis wedged focus lenses as four sub-lenses to make up a larger aperture wedged focus lens in form to focus the four beams. Given that the large aperture two-dimensional off-axis wedged focus lenses are processed and used difficultly, the wedged focus lenses are divided into three categories: the two-dimensional off-axis wedged focus lenses, the one-dimensional off-axis wedged focus lenses, and the non-off-axis wedged focus lenses. On the basis of the three modes of the wedged focus lenses and the corresponding specific incidence angles of each sub-beam, the three focus schemes for the 22 beam array are put forward to comparatively research the light intensity distribution on the target plane. Research results show that from a perspective of the coherence among the four sub-beams, the phase factors of each sub-beam respectively introducing by the three focus systems with the two-dimensional off-axis, one-dimensional off-axis, and non-off-axis wedged focus lenses are asymmetric, asymmetric and symmetric inside each sub-beam, and symmetric, asymmetric and symmetric among the four sub-beams. Therefore, the wave front consistency of the four sub-beams decreases in the order of the focus systems with the non-off-axis, two-dimensional off-axis, and one-dimensional off-axis wedged focus lenses. The focus schemes with the non-off-axis wedged focus lenses for 22 beam array can get the narrowest main-lobe, the strongest peak-value intensity, the highest energy concentration ratio on the target plane, followed by the one-dimensional off-axis and two-dimensional off-axis wedged focus lenses. The off-axis mode of the wedged focus lenses not only increases the complexity in the course of processing and using, but also increases the main-lobe size, decreases the peak-value intensity and the energy concentration ratio, which obtains a weaker focusing characteristics than that of the non-off-axis mode of the wedged focus lenses. Research results can provide an important reference for the design of the focus system in the target area of high-power laser drivers.
      通信作者: 卢兴强, xingqianglu@siom.ac.cn
    • 基金项目: 国家自然科学基金(批准号: 60707019)资助的课题.
      Corresponding author: Lu Xing-Qiang, xingqianglu@siom.ac.cn
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 60707019).
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    Ebrardt J, Chaput J M 2008 J. Phys.: Conference Series 112 032005

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    Zheng W G, Zhang X M, Wei X F, Jing F, Sui Z, Zheng K X, Yuan X D, Jiang X D, Su J Q, Zhou H, Li M Z, Wang J J, Hu D X, He S B, Xiang Y, Peng Z T, Feng B, Guo L F, Li X Q, Zhu Q H, Yu H W, You Y, Fan D Y, Zhang W Y 2008 J. Phys.: Conference Series 11 2 032009

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    [5]

    Wegner P, Auerbach J, Biesiada T, Dixit S, Lawson J, Menapace J, Parham T, Swift D, Whitman P, Williams W 2004 SPIE 5341 180

    [6]

    Su R T, Zhou P, Wang X L, Ji X, Xu X J 2012 Acta Phys. Sin. 61 084206 (in Chinese) [粟荣涛, 周朴, 王小林, 冀翔, 许晓军 2012 物理学报 61 084206]

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    Huang Z H, Wei X F, Li M Z, Wang J J, Lin H H, Xu D P, Deng Y, Zhang R 2012 Appl. Opt. 51 1546

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    Liu H K, Xue Y H, Li Z, He B, Zhou J, Ding Y Q, Jiao M L, Liu C, Qi Y F, Wei Y Q, Dong J X, Lou Q H 2012 Chin. Phys. Lett. 29 044204

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    Xiao R, Hou J, Jiang Z F 2008 Acta Phys. Sin. 57 853 (in Chinese) [肖瑞, 侯静, 姜宗福 2008 物理学报 57 853]

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    L B D, Hong M 1999 Opt. Commun. 171 185

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    Li F Q, Han W, Wang F, Zhang X M, Wei X F, Feng B, Xiang Y, Jia H T, Li K Y Laser Optoelectronics Progress 50 060002 (in Chinese) [李富全, 韩伟, 王芳, 张小民, 魏晓峰, 冯斌, 向勇, 贾怀庭, 李恪宇 2013 激光与光电子学进展 50 060002]

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    Born M, Wolf E 1999 Principles of Optics (London: Cambridge University Press) pp412-430

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出版历程
  • 收稿日期:  2015-05-26
  • 修回日期:  2015-12-02
  • 刊出日期:  2016-03-05

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