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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