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
한국광학회지 Vol. 32 No.1 (2021 February) pp. 1-8
Fig. 1 (a) Schematic of 3-channel fiber laser systems for coherent beam combining. (b) FPGA board for phase control. LD, laser diode; LDD, laser diode driver; VCO, voltage controlled oscillator; PRBS, pseudo-random binary sequence; YDF, ytterbium-doped fiber; FPGA, field programmable gate array.
단일 레이저의 출력 한계를 뛰어넘기 위한 빔결합 방법으로서, 보강간섭 원리를 이용한 타일형 결맞음 빔결합 시스템에 대해 연구하였다. 와트급 출력의 3 채널 결맞음 광섬유 레이저 및 삼각형 배치의 팁-틸트(tip-tilt) 기능을 갖춘 3 채널 출력단을 자체제작 하였다. 모니터링 시스템, 위상제어기, 3 채널 위상변조기 간의 궤환 제어 시스템(closed-loop system)을 구성하고 SPGD 알고리즘을 적용하여, 위상잠금 속도 5~67 kHz, 이상적인 계산값 대비 중심부 광세기 효율 53.3%의 성공적인 3 채널 위상잠금을 구현하였다. 빔결합 소자가 필요 없고, 가장 고출력 가능성을 가진 타일형 결맞음 빔결합을 위한 요소기술 개발이 완료되어, 향후 다채널, 고출력, 고속 제어 연구로 이어질 수 있을 것으로 기대된다.
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