• High Power Laser Science and Engineering
  • Vol. 13, Issue 2, 02000e28 (2025)
Hua Tao1,*, Xiaoliang He1,2, Chengcheng Chang1, Liqing Wu1..., Deng Liu3, Fei Chen3, Cheng Liu1,2 and Jianqiang Zhu1|Show fewer author(s)
Author Affiliations
  • 1National Laboratory on High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China
  • 2School of Science, Jiangnan University, Wuxi, China
  • 3A Center of Equipment Development Department, Beijing, China
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    DOI: 10.1017/hpl.2025.15 Cite this Article Set citation alerts
    Hua Tao, Xiaoliang He, Chengcheng Chang, Liqing Wu, Deng Liu, Fei Chen, Cheng Liu, Jianqiang Zhu, "Computational near-field and far-field parameter measurement of high-power lasers using modified coherent modulation imaging," High Power Laser Sci. Eng. 13, 02000e28 (2025) Copy Citation Text show less

    Abstract

    Accurate characterization of high-power laser parameters, especially the near-field and far-field distributions, is crucial for inertial confinement fusion experiments. In this paper, we propose a method for computationally reconstructing the complex amplitude of high-power laser beams using modified coherent modulation imaging. This method has the advantage of being able to simultaneously calculate both the near-field (intensity and wavefront/phase) and far-field (focal-spot) distributions using the reconstructed complex amplitude. More importantly, the focal-spot distributions at different focal planes can also be calculated. To verify the feasibility, the complex amplitude optical field of the high-power pulsed laser was measured after static aberrations calibration. Experimental results also indicate that the near-field wavefront resolution of this method is higher than that of the Hartmann measurement. In addition, the far-field focal spot exhibits a higher dynamic range (176 dB) than that of traditional direct imaging (62 dB).
    Error=||ξm,n(x,y)|I1|2I1. ()

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    Hua Tao, Xiaoliang He, Chengcheng Chang, Liqing Wu, Deng Liu, Fei Chen, Cheng Liu, Jianqiang Zhu, "Computational near-field and far-field parameter measurement of high-power lasers using modified coherent modulation imaging," High Power Laser Sci. Eng. 13, 02000e28 (2025)
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