Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Number of Phase Screens Required for Simulation of a High-energy Laser Beam's Propagation Experiencing Atmospheric Turbulence and Thermal Blooming

대기 난류와 열적 블루밍을 겪는 고출력 레이저 빔의 대기 전파 시뮬레이션에 필요한 위상판 개수 분석

  • Seokyoung Yoon (School of Electrical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Woohyeon Moon (School of Electrical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Hoon Kim (School of Electrical Engineering, Korea Advanced Institute of Science and Technology)
  • 윤석영 (한국과학기술원 전기및전자공학부) ;
  • 문우현 (한국과학기술원 전기및전자공학부) ;
  • 김훈 (한국과학기술원 전기및전자공학부)
  • Received : 2023.12.26
  • Accepted : 2024.01.31
  • Published : 2024.04.25
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Abstract

We analyze the number of phase screens required for the simulation of a high-energy laser beam's propagation over an atmospheric channel. For high-energy lasers exceeding tens of kilowatts (kW) in power, the laser beam is mainly affected by atmospheric turbulence and thermal blooming. When using the split-step method to implement losses due to atmospheric absorption and scattering and distortion of the beam due to turbulence and thermal blooming, the number of phase screens is a critical factor in determining the accuracy and time required for the simulation. By comparing simulation results obtained using a large number of phase screens (e.g., 150 screens) under a wide range of atmospheric turbulence conditions, we provide new guidelines for the number of phase screens required for simulating the beam propagation of a high-power laser below 2.5×106 W/m2 (e.g., a 500-kW laser beam having a 50-cm diameter).

본 연구에서는 킬로와트 급 고출력 레이저의 대기 전파 시뮬레이션에 필요한 위상판의 개수를 분석하였다. 킬로와트 급 레이저가 대기 중에 전파될 때, 주로 대기 난류와 열적 블루밍 효과에 영향을 받는다. 이에 따라 split step 방법을 사용하여 대기의 흡수 및 산란에 의한 손실, 그리고 난류와 열적 블루밍으로 인한 빔의 왜곡 현상을 구현할 때, 위상판의 개수는 시뮬레이션의 정확성 및 소요 시간을 결정짓는 중요한 요소이다. 본 연구에서는 광범위한 대기 난류 조건에서 많은 수의 위상판(예: 150개)을 사용하여 시뮬레이션을 진행하고, 레이저 출력 밀도 2.5×106 W/m2 (50 cm 직경 레이저 빔의 경우 500 kW 출력) 미만의 고출력 레이저 빔 전파 시뮬레이션에 필요한 위상판 개수에 대한 새로운 가이드 라인을 제시한다.

Keywords

Acknowledgement

BK21 Four 사업.

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