• Journal of the Korean Professional Engineers Association
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• v.40 no.6
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• pp.41-47
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• 2007

본 원고는 2007. 9. 29(토) 한양대학교 한양종합기술연구원에서 개최된 제1회 전국기술사대회에서 전 미국기술사회 로버트 에쓰 밀러 3세(Robert S. Miller III) 회장이 특별 강연한 내용입니다.

• Korean Architects
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• no.10 s.378
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• pp.48-66
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• 2000

• Korean Journal of Optics and Photonics
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• v.32 no.4
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• pp.147-152
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• 2021

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.