Volume 17 Issue 2
Mar.  2024
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Chinese Optics  > 2024  >  17(2): 366-373.
FENG Ya-fei, WEI Cheng-fu, REN Xiao-ming, GUO Jian-zeng, WANG Jie. An XY defocus aberration correction method for high-energy lasers[J]. Chinese Optics, 2024, 17(2): 366-373. doi: 10.37188/CO.2023-0142
Citation: FENG Ya-fei, WEI Cheng-fu, REN Xiao-ming, GUO Jian-zeng, WANG Jie. An XY defocus aberration correction method for high-energy lasers[J]. Chinese Optics, 2024, 17(2): 366-373. doi: 10.37188/CO.2023-0142
shu

An XY defocus aberration correction method for high-energy lasers

  • The 718 Research Institute, China State Shipbuilding Corporation Limited, Handan 056027, China

Funds:  Supported by National High-tech R&D Program (No. 51326010201)
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  • Corresponding author: ren.xiaoming@163.com
  • Received Date: 20 Aug 2023
  • Rev Recd Date: 08 Sep 2023
    • Available Online: 07 Nov 2023
    Abstract

  • A method for correcting XY defocus aberrations, based on Hartmann-Shack wavefront sensor and two-dimensional beam-shaping light path, was presented due to the large percentage of defocus and 0° astigmatism aberrations with large PV values in high-energy laser beam. The first step is to derive an expression for XY defocus aberrations by linearly combining the defocus and 0° astigmatism terms of Zernike polynomials. The coefficients directly characterize the wavefront peak-to-valley (PV) values of X and Y defocus. At the same time, compensation for XY defocus wavefronts of the laser beam can be achieved by fine-tuning the mirror spacing in the two-dimensional shaping optics of the high-energy laser. Therefore, the Hartmann wavefront sensor is used to extract the coefficients of XY defocus aberrations from the laser beam. The computer dynamically adjusts the mirror spacing in the two-dimensional shaping optics based on these coefficient values to correct XY defocus aberrations and improve the beam quality of the output laser beam. The results of the experiment showcase a significant decrease in PV value of XY defocus aberrations from 5.2 μm and 1.1 μm to less than 0.5 μm, as well as a decrease in β factor from 3.1 to 1.8, resulting in substantial improvement in beam quality.

     

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