Development of 19.8 MHz repetition rate optical frequency combs for dual-comb spectroscopy

被引：2
|
作者：
Ikeda K. [1 ,2 ]
Yamada Y. [1 ,2 ]
Kato H. [1 ]
Yoshii K. [1 ,2 ]
Okubo S. [2 ,3 ]
Inaba H. [2 ,3 ]
Hong F.-L. [1 ,2 ]
机构：
[1] Department of Physics, Graduate School of Engineering Science, Yokohama National University, Kanagawa, Yokohama
[2] JST, ERATO, MINOSHIMA Intelligent Optical Synthesizer Project, Chofu, Tokyo
[3] National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Tsukuba
来源：
Jpn. J. Appl. Phys. | 2020年 / 2卷
关键词：
Absorption lines - Er: fiber laser - Frequency spacing - Nonlinear polarization evolution - Optical frequency combs - Self-referencing - Servo bandwidth - Vibration bands;
D O I：
10.35848/1347-4065/ab6b73
中图分类号：
学科分类号：
摘要：
We demonstrate two self-referencing optical frequency combs with a repetition rate of 19.8 MHz, which is the lowest ever reported, using nonlinear-polarization-evolution mode-locked Er:fiber lasers. The two combs are phase-locked with a common CW laser at 1.5 μm using high-speed feedback controls with servo bandwidths of 380 kHz. Over 40 absorption lines of the ν 1 + ν 3 vibration band of 13C2H2 are observed by dual-comb spectroscopy using those combs. We resolve the observed Doppler-limited lines with a 19.8 MHz frequency spacing (repetition rate), which is currently the smallest frequency spacing achieved, to the best of our knowledge. © 2020 The Japan Society of Applied Physics.
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