Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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High-power Yb Fiber Laser with 3.0-kW Output

3.0 kW 고출력 발진 단일 모드 Yb 광섬유 레이저

  • 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.)
  • 박종선 (한양대학교 에리카 나노광전자학과) ;
  • 박은지 (한양대학교 ERICA 응용물리학과) ;
  • 오예진 (한양대학교 에리카 나노광전자학과) ;
  • 정훈 (한국생산기술연구원 청정생산시스템연구소) ;
  • 김지원 (한양대학교 에리카 나노광전자학과) ;
  • 정예지 ((주)한화종합연구소 레이저센터) ;
  • 이강인 ((주)한화종합연구소 레이저센터) ;
  • 이용수 ((주)한화종합연구소 레이저센터) ;
  • 조준용 ((주)한화종합연구소 레이저센터)
  • Received : 2021.05.27
  • Accepted : 2021.06.26
  • Published : 2021.08.25
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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.

본 논문에서는 최고 출력 3.0 kW 발진 단일 모드 이터븀(ytterbium, Yb) 첨가 광섬유 레이저에 대해 보고한다. 고출력 광섬유 레이저의 출력을 제한하는 주된 요소인 유도 라만 산란 문턱 값과 광섬유 내 온도 분포를 계산하고 이를 바탕으로 양방향 펌핑 구조의 단일 공진기 Yb 광섬유 레이저 시스템을 제작하였다. 그 결과 4.1 kW의 펌프 출력에서 최고 출력 3.0 kW의 레이저 빔을 얻을 수 있었고, 그때의 기울기 효율은 81.5%로 계산되었다. 최고 출력에서 측정된 출력 빔의 빔질(M2)은 1.26으로 단일 공간 모드 빔 출력 특성을 가지고 있음을 확인하였고, 유도 라만 산란 및 횡모드 불안정 현상은 관측되지 않았다. 본 연구에서 얻은 광섬유 레이저 출력 결과는 지금까지 국내에서 보고된 다이오드 레이저로 펌핑한 광섬유 레이저 출력 중 가장 높은 출력이며, 향후 더 높은 출력을 얻기 위한 방법에 대해 논의하고자 한다.

Keywords

References

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