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http://dx.doi.org/10.3807/KJOP.2021.32.1.001

3-channel Tiled-aperture Coherent-beam-combining System Based on Target-in-the-loop Monitoring and SPGD Algorithm  

Kim, Youngchan (Advanced Photonics Research Institute, GIST)
Yun, Youngsun (Advanced Photonics Research Institute, GIST)
Kim, Hansol (Department of Electrical and Computer Engineering, Seoul National University)
Chang, Hanbyul (Department of Electrical and Computer Engineering, Seoul National University)
Park, Jaedeok (Department of Energy Systems Research, Ajou University)
Choe, Yunjin (Department of Energy Systems Research, Ajou University)
Na, Jeongkyun (Department of Electrical and Computer Engineering, Seoul National University)
Yi, Joohan (Department of Electrical and Computer Engineering, Seoul National University)
Kang, Hyungu (Department of Electrical and Computer Engineering, Seoul National University)
Yeo, Minsu (Department of Electrical and Computer Engineering, Seoul National University)
Choi, Kyuhong (Advanced Photonics Research Institute, GIST)
Noh, Young-Chul (Advanced Photonics Research Institute, GIST)
Jeong, Yoonchan (Department of Electrical and Computer Engineering, Seoul National University)
Lee, Hyuk-Jae (Department of Electrical and Computer Engineering, Seoul National University)
Yu, Bong-Ahn (Advanced Photonics Research Institute, GIST)
Yeom, Dong-Il (Department of Energy Systems Research, Ajou University)
Jun, Changsu (Advanced Photonics Research Institute, GIST)
Publication Information
Korean Journal of Optics and Photonics / v.32, no.1, 2021 , pp. 1-8 More about this Journal
Abstract
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.
Keywords
Interference; Tiled-aperture coherent beam combining; Fiber laser; SPGD algorithm;
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