Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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High-power Operation of a Yb Fiber Laser at 1018 nm

1018 nm 파장의 고출력 Yb 광섬유 레이저

  • Oh, Ye Jin (Department of Photonics and Nanoelectronics, Hanyang University ERICA) ;
  • Park, Hye Mi (Department of Photonics and Nanoelectronics, Hanyang University ERICA) ;
  • Park, Jong Seon (Department of Photonics and Nanoelectronics, Hanyang University ERICA) ;
  • Park, Eun Ji (Department of Applied Physics, Hanyang University ERICA) ;
  • Kim, Jin Phil (Department of Photonics and Nanoelectronics, Hanyang University ERICA) ;
  • Jeong, Hoon (Research Institute of Clean Manufacturing Systems, Korea Institute of Industrial Technology) ;
  • Kim, Ji Won (Department of Photonics and Nanoelectronics, Hanyang University ERICA) ;
  • Kim, Tae Hyoung (Laser Research and Development Team, LIG Nex1) ;
  • Jeong, Seong Mook (Laser Research and Development Team, LIG Nex1) ;
  • Kim, Ki Hyuck (Laser Research and Development Team, LIG Nex1) ;
  • Yang, Hwan Seok (Laser Research and Development Team, LIG Nex1)
  • 오예진 (한양대학교 ERICA 나노광전자학과) ;
  • 박혜미 (한양대학교 ERICA 나노광전자학과) ;
  • 박종선 (한양대학교 ERICA 나노광전자학과) ;
  • 박은지 (한양대학교 ERICA 응용물리학과) ;
  • 김진필 (한양대학교 ERICA 나노광전자학과) ;
  • 정훈 (한국생산기술연구원 청정생산시스템연구소) ;
  • 김지원 (한양대학교 ERICA 나노광전자학과) ;
  • 김태형 (LIG 넥스원 레이저 연구개발팀) ;
  • 정성묵 (LIG 넥스원 레이저 연구개발팀) ;
  • 김기혁 (LIG 넥스원 레이저 연구개발팀) ;
  • 양환석 (LIG 넥스원 레이저 연구개발팀)
  • Received : 2021.07.13
  • Accepted : 2021.08.08
  • Published : 2021.10.25
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Abstract

High-power continuous-wave operation of a Yb-doped double-clad fiber laser at 1018 nm, pumped by high-power diode lasers at 976 nm, is reported. Based on numerical calculation of the gain and laser signal power along the length of the Yb fiber, it is found that robust operation at 1018 nm can be achieved for a high Yb3+-ion excitation density greater than 11.5%, accompanied by high suppression of the feedback from the fiber's end facet. The Yb fiber laser constructed in house yields 626 W of continuous-wave output at 1018 nm for 729 W of incident pump power, corresponding to a slope efficiency of 86.6%. The prospect for power scaling is considered.

본 논문에서는 단파장 영역인 1018 nm에서 최고 출력 626 W를 가진 고출력 이터븀(ytterbium, Yb) 첨가 광섬유 레이저에 대해 보고한다. Yb 광섬유 레이저에서 이득률이 낮은 단파장 영역인 1018 nm에서 레이저를 발진시키기 위한 조건을 이론적으로 조사해보고, 광섬유 끝 단단면 조건에 따른 되먹임 신호를 측정하여 안정적인 레이저 발진 조건에 대하여 연구하였다. 그 결과를 바탕으로 제작한 단일 공진기 구조의 Yb 광섬유 레이저 시스템으로부터 729 W의 펌프 출력에서 최고 출력 626 W의 1018 nm 파장 레이저 출력을 안정적으로 얻을 수 있었으며 그때 기울기 효율은 86.6%로 측정되었다. 본 연구에서 얻은 1018 nm 파장의 Yb 광섬유 레이저 결과는 지금까지 국내에서 보고된 1030 nm 이하 단파장에서 발진된 Yb 광섬유 레이저 출력 중 가장 높은 출력이며, 세계적으로도 상용 Yb 광섬유와 광부품을 사용한 결과 중 가장 높은 출력에 해당된다. 그리고 향후 더 높은 출력을 얻기 위한 방법에 대해 논의하고자 한다.

Keywords

References

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