Volume 14 Issue 2
Mar.  2021
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Chinese Optics  > 2021  >  14(2): 353-360.
WANG Yan-ru, WANG Jian-zhong, RAN Zheng-hui, DING Yu-jie. Analysis of effects on the beam quality β factor of high power laser[J]. Chinese Optics, 2021, 14(2): 353-360. doi: 10.37188/CO.2020-0137
Citation: WANG Yan-ru, WANG Jian-zhong, RAN Zheng-hui, DING Yu-jie. Analysis of effects on the beam quality β factor of high power laser[J]. Chinese Optics, 2021, 14(2): 353-360. doi: 10.37188/CO.2020-0137
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Analysis of effects on the beam quality β factor of high power laser

  • Metrology and Testing Center, China Academy of Engineering Physics, Mianyang 621900, China

Funds:  Supported by Basic Project of Science Technology and Industry for National Defense (No. JSJL2017212B002)
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  • Corresponding author: WJLZ1999@sina.com
  • Received Date: 27 Jul 2020
  • Rev Recd Date: 15 Aug 2020
    • Available Online: 05 Feb 2021
  • Publish Date: 23 Mar 2021
    Abstract
  • The influencing factors of beam quality β factor of high-energy laser system is analyzed based on two-dimension chirp z transformation. The effects of the sampling number within the diffraction limit and the beam spot’s energy loss on the beam quality β factor are analyzed. The simulation results based on different sampling numbers indicate that a larger sampling number induces higher beam spot diffraction image resolution which is beneficial for more accurate calculation of a beam quality β factor. When the sampling number of the diffraction limit angle is no less than ten, the measurement error can be limited within 3%. Meanwhile, different wavefront aberrations have different sensitivities against beam spot energy loss. The beam quality β factor of high order wavefront aberration is larger than that of low order aberration with equal energy loss. Especially, the spherical aberration is most sensitive to energy loss, and about 5% energy loss can induce 15% to 30% calculation error of the β factor.

     

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