Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Theoretical Analysis of Impact of Q-switch Rise Time on Output Pulse Performance in an Ytterbium-doped Actively Q-switched Fiber Laser

이터븀 첨가 능동형 Q-스위칭 광섬유 레이저에서 Q-스위치 상승 시간이 출력 펄스에 미치는 영향에 대한 이론적 분석

  • Jeon, Jinwoo (School of Electrical and Computer Engineering, University of Seoul) ;
  • Lee, Junsu (School of Electrical and Computer Engineering, University of Seoul) ;
  • Lee, Ju Han (School of Electrical and Computer Engineering, University of Seoul)
  • 전진우 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 이준수 (서울시립대학교 전자전기컴퓨터공학부) ;
  • 이주한 (서울시립대학교 전자전기컴퓨터공학부)
  • Received : 2013.02.27
  • Accepted : 2013.04.15
  • Published : 2013.04.25
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Abstract

A theoretical analysis of the impact of rise time of a Q-switch on the output pulse performance is carried out in an Ytterbium-doped actively Q-switched fiber laser. The finite difference time domain (FDTD) method is used to numerically simulate the Q-switched fiber laser. It is shown that stable Gaussian-like pulse shape can be generated when the Q-switch rise time is increased and pulse repetition rate is enlarged.

본 논문에서는 능동형 Q-스위칭 광섬유 레이저에서 Q-스위치 상승 시간이 출력 펄스에 미치는 영향을 이론적으로 분석하였다. Finite Difference Time Domain (FDTD) 방법을 이용해서 비율 방정식과 전파 방정식에 대한 모델링을 수행하였다. Q-스위칭 광섬유 레이저에서 발생하는 Q-스위칭 펄스의 생성에 있어서 Q-스위치의 상승 시간이 출력 펄스 특성에 미치는 영향을 이론적으로 분석하였다. 또한, Q-스위치의 반복률에 따른 출력 펄스의 에너지 변화와 파형 변화를 확인하였다. Q-스위치 반복률이 높아지고, Q-스위치의 상승 시간이 길어질수록 출력 펄스의 멀티 피크 현상이 줄어들고 안정된 가우시안 형태의 펄스 파형이 발생함을 확인 할 수 있었다.

Keywords

References

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