Kilohertz Gain-Switched Ti:sapphire Laser Operation and Femtosecond Chirped-Pulse Regenerative Amplification

KHz 반복률에서의 Ti:sapphire 이득 스위칭 레이저 발진과 펨토초 처프펄스 재생 증폭

  • Lee, Yong-In (Division of Energy Systems Research, Ajou University) ;
  • Ahn, Yeong-Hwan (Division of Energy Systems Research, Ajou University) ;
  • Lee, Sang-Min (Division of Energy Systems Research, Ajou University) ;
  • Seo, Min-Ah (Department of Physics, Seoul National University) ;
  • Kim, Dai-Sik (Department of Physics, Seoul National University) ;
  • Rotermund, Fabian (Division of Energy Systems Research, Ajou University)
  • 이용인 (아주대학교 에너지시스템학부) ;
  • 안영환 (아주대학교 에너지시스템학부) ;
  • 이상민 (아주대학교 에너지시스템학부) ;
  • 서민아 (서울대학교 물리학부) ;
  • 김대식 (서울대학교 물리학부) ;
  • Published : 2006.12.25


We present a comprehensive study of a chirped pulse Ti:sapphire regenerative amplifier system operating at 1 kHz. Main constituents of the system are described in detail. The amplifier stage was first converted to a repetition rate-tunable kHz gain-switched nanosecond Ti:sapphire laser. Operation characteristics at different repetition rates such as build-up times of laser pulses, pump power-dependent output powers and pulse durations, damage thresholds, and tunability ranges were studied. Based on the results achieved, the switching time of the Pocket's cell used and the round trip numbers in the regenerative amplifier were optimized at 1 kHz. The output pulses with a pulse width of 50fs from a home-made Ken lens mode-locked Ti:sapphire oscillator were used as seed pulses. The pulses were expanded to 120ps in a grating stretcher prior to coupling into the 3-mirror amplifier cavity. After amplification and recompression, a stable 1kHz Ti:sapphire regenerative amplifier system, which delivers 85-fs, $320-{\mu}J$ pulses, was fully constructed.


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