제 28회 광전자 및 광통신 학술회의
학술지/홍보지
Current Optics and Photonics
Vol. 5, No.1
(Feb. 2021)
한국광학회지
Vol. 32, No.1
(Feb. 2021)
K-Light
Vol4, No.1(Jan. 2021)
Current Optics and Photonics
Vol. 5, No.1
(Feb. 2021)
한국광학회지
Vol. 32, No.1
(Feb. 2021)
K-Light
Vol4, No.1(Jan. 2021)
![[편집위원회 선정 논문] 한국광학회지 Vol. 32 No.1 (2021 February)_2](http://osk.inforang.com/upload/posts_thumb/2021/04/1617602707_65574700_408693856-thumb.png)
[편집위원회 선정 논문] 한국광학회지 Vol. 32 No.1 (2021 February)_2
목표물 신호 모니터링 및 SPGD 알고리즘 기반 3 채널 타일형 결맞음 빔결합 시스템 연구
3-channel Tiled-aperture Coherent-beam-combining System Based on Target-in-the-loop Monitoring and SPGD Algorithm
김영찬1ㆍ윤영선1ㆍ김한솔2ㆍ장한별2ㆍ박재덕4ㆍ최윤진4ㆍ나정균2ㆍ이주한2ㆍ강현구2ㆍ여민수2ㆍ최규홍1ㆍ노영철1 ㆍ정윤찬2,3ㆍ이혁재2,3ㆍ유봉안1ㆍ염동일4,5ㆍ전창수1†
Youngchan Kim1, Youngsun Yun1, Hansol Kim2, Hanbyul Chang2, Jaedeok Park4, Yunjin Choe4, Jeongkyun Na2, Joohan Yi2, Hyungu Kang2, Minsu Yeo2, Kyuhong Choi1, Young-Chul Noh1, Yoonchan Jeong2,3, Hyuk-Jae Lee2,3, Bong-Ahn Yu1, Dong-Il Yeom4,5, Changsu Jun1
Korean Journal of Optics and Photonics Vol. 32 No. 1, February 2021, pp. 1-8
DOI: https://doi.org/10.3807/KJOP.2021.32.1.001
We have studied a tiled-aperture coherent-beam-combining system based on constructive interference, as a way to overcome the power limitation of a single laser. A 1-watt-level, 3-channel coherent fiber laser and a 3-channel fiber array of triangular tiling with tip-tilt function were developed. A monitoring system, phase controller, and 3-channel phase modulator formed a closed-loop control system, and the SPGD algorithm was applied. Eventually, phase-locking with a rate of 5–67 kHz and peak-intensity efficiency comparable to the ideal case of 53.3% was successfully realized. We were able to develop the essential elements for a tiled-aperture coherent-beam-combining system that had the potential for highest output power without any beam-combining components, and a multichannel coherent-beam-combining system with higher output power and high speed is anticipated in the future.
![[편집위원회 선정 논문] 한국광학회지 Vol. 32 No.1 (2021 February)_1](http://osk.inforang.com/upload/posts_thumb/2021/04/1617602530_91160300_130449564-thumb.png)
[편집위원회 선정 논문] 한국광학회지 Vol. 32 No.1 (2021 February)_1
프레넬 렌즈를 이용한 항공장애등 광학계 최적 설계
Optimization of the Optical System for an Aircraft Warning Light Using a Fresnel Lens
김종태†ㆍ박현준
Jong-Tae Kim , Hyeon-Jun Park
Korean Journal of Optics and Photonics Vol. 32 No. 1, February 2021, pp. 15-21
DOI: https://doi.org/10.3807/KJOP.2021.32.1.015
Abstract
In this paper, an aircraft warning light’s optical system was designed using an LED light-source module and a collimating Fresnel lens. As for the optical system, a collimator Fresnel lens was designed for each module to satisfy a vertical-elevation center luminous intensity of 20,000 cd and the divergence-angle luminous-intensity standard conditions of the Ministry of Land for Infrastructure and Transport for aircraft warning lights. In addition, the optical system was optimized by adjusting the position and tilt of the LED light-source module and Fresnel lens. By analyzing and comparing the light-distribution characteristics of the optical system, an aircraft-warning-light optical system with optimal performance was obtained.
