Current Optics and Photonics

  • 제8권4호
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  • Pages.406-415
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  • 2024
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  • 2508-7266(pISSN)
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  • 2508-7274(eISSN)
한국광학회 (Optical Society of Korea)
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Analysis of Major Error Factors in Coherent Beam Combination: Phase, Tip Tilt, Polarization Angle, and Beam Quality

  • Jeongkyun Na (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Byungho Kim (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Changsu Jun (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology) ;
  • Yoonchan Jeong (Department of Electrical and Computer Engineering, Seoul National University)
  • 투고 : 2024.05.07
  • 심사 : 2024.06.27
  • 발행 : 2024.08.25
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초록

The major error factors that degrade the efficiency of coherent beam combining (CBC) are numerically studied in a comprehensive manner, paying particular attention to phase, tip-tilt, polarization angle, and beam quality. The power in the bucket (PIB), normalized to the zero-error PIB, is used as a figure of merit to quantify the effect of each error factor. To maintain a normalized PIB greater than or equal to 95% in a 3-channel CBC configuration, the errors in phase, tip-tilt, and polarization angle should be less than 1.06 radians, 1.25 ㎛, and 1.06 radians respectively, when each of the three parameters is calculated independently with the other two set to zero. In a worst-case scenario of the composite errors within the parameter range for the independent-95%-normalized-PIB condition, the aggregate effect would reduce the normalized PIB to 83.8%. It is noteworthy that the PIB performances of a CBC system, depending on phase and polarization-angle errors, share the same characteristic feature. A statistical approach for each error factor is also introduced, to assess a CBC system with an extended number of channels. The impact of the laser's beam-quality factor M2 on the combining efficiency is also analyzed, based on a super-Gaussian beam. When M2 increases from 1 to 1.3, the normalized PIB is reduced by 2.6%, 11.8%, 12.8%, and 13.2% for a single-channel configuration and 3-, 7-, and 19-channel CBC configurations respectively. This comprehensive numerical study is expected to pave the way for advances in the evaluation and design of multichannel CBC systems and other related applications.

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과제정보

Agency for Defense Development of South Korea (UD210019ID); the BK21 FOUR Project.

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