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http://dx.doi.org/10.3807/KJOP.2021.32.4.147

High-power Yb Fiber Laser with 3.0-kW Output  

Park, Jong Seon (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Park, Eun Ji (Department of Applied Physics, University of Hanyang ERICA)
Oh, Ye Jin (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Jeong, Hoon (Manufacturing System R&D Department, Korea Institute of Industrial Technology)
Kim, Ji Won (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Jung, Yeji (Laser and Sensor Systems Team, Defense R&D Center, Hanwha Co.)
Lee, Kangin (Laser and Sensor Systems Team, Defense R&D Center, Hanwha Co.)
Lee, Yongsoo (Laser and Sensor Systems Team, Defense R&D Center, Hanwha Co.)
Cho, Joonyong (Laser and Sensor Systems Team, Defense R&D Center, Hanwha Co.)
Publication Information
Korean Journal of Optics and Photonics / v.32, no.4, 2021 , pp. 147-152 More about this Journal
Abstract
We report high-power continuous-wave operation of a Yb-doped fiber laser at 1070 nm, pumped by high-power laser diodes at 976 nm. Based on theoretical calculation of the stimulated Raman scattering and temperature distribution in the fiber, we construct a bidirectionally pumped Yb-fiberlaser system incorporating a pair of fiber Bragg gratings and a cladding light stripper. The fiber laser yields 3.0 kW of continuous-wave output at 1070 nm in a diffraction-limited beam with M2 ≈ 1.26 for 4.1 kW of incident pump power, corresponding to a slope efficiency of 81.5%. The prospects for further power scaling are discussed.
Keywords
Fiber laser; High power fiber laser; Infrared laser; Ytterbium laser;
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