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Yusuke Hisai

Yokohama National University

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Featured researches published by Yusuke Hisai.

conference on lasers and electro optics | 2017

Development of an 8-branch optical frequency comb for laser frequency stabilization

Yusuke Hisai; Daisuke Akamatsu; Takumi Kobayashi; Sho Okubo; Hajime Inaba; Feng-Lei Hong; Kazumoto Hosaka

We have developed an 8-branch frequency comb using 3 stages of fiber couplers for frequency stabilization of multiple lasers. A Ti:Sapphire laser is frequency-stabilized to the comb and evaluated in regard to the frequency stability.

conference on lasers and electro optics | 2016

High-precision spectroscopy using ultra-compact lasers

Kazumichi Yoshii; Yusuke Hisai; Feng-Lei Hong

We demonstrate high-precision spectroscopy of molecular iodine using ultra-compact diode laser modules at 531, 561 and 594 nm. Entire hyperfine structures of iodine lines are obtained with a linewidth of a few MHz.

conference on lasers and electro optics | 2018

Determination of the offset frequency of a broadband frequency comb generated in a waveguide-type periodically poled lithium niobate crystal

Kazumichi Yoshii; Junia Nomura; Kaho Taguchi; Yusuke Hisai; Feng-Lei Hong

conference on lasers and electro optics | 2018

An 8-branch optical frequency comb for laser frequency stabilization and measurement in optical lattice clocks

Yusuke Hisai; Daisuke Akamatsu; Takumi Kobayashi; Sho Okubo; Hajime Inaba; Kazumoto Hosaka; Feng-Lei Hong; Masami Yasuda

The Japan Society of Applied Physics | 2018

Measurement of the offset frequency of a broadband frequency comb generated in a waveguide-type periodically poled lithium niobate crystal

Kazumichi Yoshii; Junia Nomura; Kaho Taguchi; Yusuke Hisai; Fen-Lei Hong

The Japan Society of Applied Physics | 2018

Evaluation by MOT temperature measurement of light source at 556 nm based on ECDL using an interference filter

Kohei Aoki; Yusuke Hisai; Takumi Kobayashi; Daisuke Akamatsu; Masami Yasuda; Takuya Kohno

Journal of The Optical Society of America B-optical Physics | 2018

Compact frequency-stabilized pump laser for wavelength conversion in long-distance quantum communication

Kohei Ikeda; Yusuke Hisai; Kazumichi Yoshii; Hideo Kosaka; Feng-Lei Hong; Tomoyuki Horikiri

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control | 2018

Uncertainty evaluation of an 171Yb optical lattice clock at NMIJ

Takumi Kobayashi; Daisuke Akamatsu; Yusuke Hisai; Takehiko Tanabe; Hajime Inaba; Tomonari Suzuyama; Feng-Lei Hong; Kazumoto Hosaka; Masami Yasuda

IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control | 2018

Dual-Mode Operation of an Optical Lattice Clock Using Strontium and Ytterbium Atoms

Daisuke Akamatsu; Takumi Kobayashi; Yusuke Hisai; Takehiko Tanabe; Kazumoto Hosaka; Masami Yasuda; Feng-Lei Hong

Applied Optics | 2018

Evaluation of laser frequency offset locking using an electrical delay line

Yusuke Hisai; Kohei Ikeda; Haruki Sakagami; Tomoyuki Horikiri; Takumi Kobayashi; Kazumichi Yoshii; Feng-Lei Hong

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Feng-Lei Hong

Yokohama National University

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Kazumichi Yoshii

Kyoto University

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Takumi Kobayashi

National Institute of Advanced Industrial Science and Technology

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Daisuke Akamatsu

National Institute of Advanced Industrial Science and Technology

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Kazumoto Hosaka

National Institute of Advanced Industrial Science and Technology

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Masami Yasuda

National Institute of Advanced Industrial Science and Technology

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Hajime Inaba

National Institute of Advanced Industrial Science and Technology

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Kohei Ikeda

Yokohama National University

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Tomoyuki Horikiri

Yokohama National University

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Hideo Kosaka

Tohoku University

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