Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Increased Efficiency of Long-distance Optical Energy Transmission Based on Super-Gaussian

수퍼 가우시안 빔을 이용한 레이저 전력 전송 효율 개선

  • 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) ;
  • Hyesun Cha (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Yoonchan Jeong (Department of Electrical and Computer Engineering, Seoul National University)
  • 나정균 (서울대학교 전기정보공학부) ;
  • 김병호 (서울대학교 전기정보공학부) ;
  • 전창수 (광주과학기술원 고등광기술연구소) ;
  • 차혜선 (서울대학교 전기정보공학부) ;
  • 정윤찬 (서울대학교 전기정보공학부)
  • Received : 2024.05.07
  • Accepted : 2024.06.17
  • Published : 2024.08.25
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Abstract

One of the key factors in research regarding long-distance laser beam propagation, as in free-space optical communication or laser power transmission, is the transmission efficiency of the laser beam. As a way to improve efficiency, we perform extensive numerical simulations of the effect of modifying the laser beam's profile, especially replacing the fundamental Gaussian beam with a super-Gaussian beam. Numerical simulations of the transmitted power in the ideal diffraction-limited beam diameter determined by the optical system of the transmitter, after about 1-km propagation, reveal that the second-order super-Gaussian beam can yield superior performance to that of the fundamental Gaussian beam, in both single-channel and coherently combined multi-channel laser transmitters. The improvement of the transmission efficiency for a 1-km propagation distance when using a second-order super-Gaussian beam, in comparison with a fundamental Gaussian beam, is estimated at over 1.2% in the singlechannel laser transmitter, and over 4.2% and over 4.6% in coherently combined 3- and 7-channel laser transmitters, respectively. For a range of the propagation distance varying from 750 to 1,250 m, the improvement in transmission efficiency by use of the second-order super-Gaussian beam is estimated at over 1.2% in the single-channel laser transmitter, and over 4.1% and over 4.0% in the coherently combined 3- and 7-channel laser transmitters, respectively. These simulation results will pave the way for future advances in the generation of higher-order super-Gaussian beams and the development of long-distance optical energy-transfer technology.

자유 공간 광 통신 또는 레이저 전력 전송과 같은 장거리 레이저 빔 전파 연구의 핵심 요소 중 하나는 레이저 빔의 전송 효율이다. 본 논문에서는 레이저 에너지 전송의 효율을 개선하기 위해 레이저 빔의 공간적 분포를 변형하는 방법을 제안하였으며, 특히 수퍼 가우시안 빔을 대상으로 수치 해석을 진행해 그 유효성을 확인하였다. 송신기의 광학 시스템에 의해 결정된 회절 한계 반지름 이내로 수신되는 전력의 양을 기준으로, 2차 수퍼 가우시안 레이저 빔이 1 km 거리를 전파할 때 단일 채널과 다중 채널에서 모두 전송 효율이 개선되는 것을 확인하였다. 또한 1 km 전파거리를 전제로 기본 가우시안 빔과 2차 수퍼 가우시안 빔을 사용하는 상황을 비교하였을 때, 전송 효율 개선률이 단일 채널 레이저에서 1.2% 이상, 3채널 및 7채널에서는 각각 4,2% 및 4.6% 이상이라는 결과를 얻었다. 레이저 빔의 전파거리가 750 m에서 1,250 m 사이인 경우, 2차 수퍼 가우시안 빔의 전송효율 개선률은 단일, 3채널, 7채널일 때 각각 1.2%, 4.1%, 4.0% 이상으로 전송 효율의 우위가 유지되었다.

Keywords

Acknowledgement

국방과학연구소(Grant no. UD210019ID); BK21Four Project.

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