Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Soliton Mode-locking and Numerical Analysis of Yb3+-doped Potassium Double Tungstate Lasers in Compact Laser Cavity Geometries

Yb3+ 도핑된 칼륨 이중 텅스테이트 결정을 이용한 소형 공진기에서의 솔리톤 모드 잠금 레이저 구현 및 수치 해석

  • Deok Woo Kim (Department of Physics, Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Kwang Hoon Ko (Quantum Optics Research Division, Korea Atomic Energy Research Institute (KAERI)) ;
  • Fabian Rotermund (Department of Physics, Korea Advanced Institute of Science and Technology (KAIST))
  • 김덕우 (한국과학기술원 물리학과) ;
  • 고광훈 (한국원자력연구원 양자광학연구부) ;
  • 이상민 (한국과학기술원 물리학과)
  • Received : 2024.07.22
  • Accepted : 2024.09.09
  • Published : 2024.10.25
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Abstract

In this study, we demonstrate compact mode-locked laser operations using three different kinds of Yb3+-doped potassium double tungstate laser crystals, Yb:KGdW, Yb:KYW and Yb:KLuW, operating near 1040 nm at a repetition rate of 405 MHz. We utilized a semiconductor saturable absorber mirror as a mode locker, successfully maintaining mode-locked states for several hours without any Q-switching instabilities for all types of laser crystals. Notably, the Yb:KGdW mode-locked laser produces the shortest pulse with a duration of 108 fs, delivering 125 mW of output power. Additionally, we conducted a numerical analysis by solving the Haus master equation, which incorporates the effect of group delay dispersion and self-phase modulation, using the standard split-step Fourier method.

본 연구에서는 Yb3+ 이온이 도핑된 세 종류의 이중 텅스텐 결정, Yb:KGdW, Yb:KYW 및 Yb:KLuW을 사용하여 1039 nm의 중심파장 영역에서 반복율이 405 MHz인 연속파 모드 잠금된 소형 고체 레이저를 구현하였다. 모드 잠금을 위한 광스위칭 소자로 반도체 포화 흡수체 거울을 사용하였고, 모드 잠금 상태들은 세 결정 모두에서 수 시간 이상 Q-스위칭 불안정성 없이 안정적으로 동작하였다. 특히 Yb:KGdW 결정을 이용한 레이저는 최고 출력 125 mW에서 108 fs의 펄스폭을 갖는 펄스를 방출하였다. 또한 표준 분할 단계 푸리에 방법을 이용하여 공진기의 군지연 분산 및 자체 위상 변조를 고려한 Haus master 방정식을 수치 해석으로 풀고, 그 결과를 실험결과와 비교 및 분석하였다.

Keywords

Acknowledgement

본 연구는 한국연구재단(NRF) (Grant no. RS-2024-00408271), 산업통상자원부(MOTIE)와 한국에너지기술평가원(KETEP) (Grant no. 20224B10100040)의 지원으로 수행되었음.

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