Narrow-linewidth and highly stable optical frequency comb realized with a simple electro-optic modulator system in a mode-locked Er:fiber laser

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  • Asahina, Yu
    Department of Physics, Graduate School of Engineering Science, Yokohama National University JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Yoshii, Kazumichi
    Department of Physics, Graduate School of Engineering Science, Yokohama National University JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Yamada, Yuko
    Department of Physics, Graduate School of Engineering Science, Yokohama National University JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Hisai, Yusuke
    Department of Physics, Graduate School of Engineering Science, Yokohama National University JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Okubo, Sho
    National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST) JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Wada, Masato
    National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST) JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Inaba, Hajime
    National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST) JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project
  • Hasegawa, Takemi
    Sumitomo Electric Industries, Ltd
  • Yamamoto, Yoshinori
    Sumitomo Electric Industries, Ltd
  • Hong, Feng-Lei
    Department of Physics, Graduate School of Engineering Science, Yokohama National University JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project

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We demonstrate a mode-locked Er:fiber laser with a compact fiber-pigtailed optical bench containing a free-space electro-optic modulator for high-speed feedback control. The achieved servo bandwidth of the beat frequency between a given comb component and a reference laser is approximately 850 kHz. The realization of a narrow-linewidth and highly stable frequency comb is confirmed by measuring both in-loop and out-of-loop beat frequencies. We also demonstrate the frequency measurement of two iodine-stabilized Nd:YAG lasers through the narrow-linewidth comb without stability degradation. The developed optical frequency comb can work continuously for weeks without maintenance.

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