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Development of Y-band solid-state astro-comb with long-term stability for exoplanet search

Research Project

Project/Area Number 20K05357
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 30020:Optical engineering and photon science-related
Research InstitutionThe University of Tokyo

Principal Investigator

Yoshioka Kosuke  東京大学, 大学院工学系研究科(工学部), 准教授 (70451804)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsフェムト秒光周波数コム / 天文コム / 系外惑星探査 / Yバンド / 近赤外 / 光周波数コム / レーザー分光
Outline of Research at the Start

恒星の視線速度の変化による極僅かな光のドップラーシフトを捉えハビタブルゾーンの地球型系外惑星を観測するための、Yバンド(980 nm-1080 nm)におけるコンパクトかつ長期的に高い再現性を有する天文コムを実現する。超高繰り返しフェムト秒チタンサファイア光周波数コムの安定動作を堅牢化し、超低分散共振器ミラーによって広帯域に縦モード選択を行った上で無人運転可能なシステムに拡張する。大型望遠鏡における実地試験を通じて高分散分光器の校正能力を調べるとともに、精密分光分野に重要な簡便な光周波数測定器としての貢献にもつなげていく。

Outline of Final Research Achievements

By employing a mechanism for relaxing the performance requirements of a filter resonator using an ultra-high repetition rate titanium-sapphire femtosecond optical frequency comb, we have achieved a compact and stable astro-comb. Using the HIDES high-dispersion spectrograph of the Okayama Astrophysical Observatory's 188cm reflector telescope, we successfully conducted separated observations of each optical frequency of the astro-comb in the visible light range. This marked the first successful calibration of a high-dispersion spectrograph at an observatory in Japan. Furthermore, through minimizing the dispersion of the filter resonator and introducing a vacuum chamber, we realized an astronomical comb capable of wideband and highly calibrated measurements in the Y-band of the near-infrared region. This comb is suitable for long-duration observations.

Academic Significance and Societal Importance of the Research Achievements

地上の天文台における恒星の観測を超高精度化することで、地球に類似のハビタブル惑星の存在が可能となる。この高精度化を実現するのが、絶対周波数が定まった光周波数の校正器である光周波数コムを用いた高分散分光器の校正である。実観測に資する性能や長期安定性を天文台の環境で実現するのは困難な状況が続いていたが、本研究でこれを解決する方法を提示するとともに、実際に国内の天文台での実証実験を成功させた。また、軽い質量が想定されるハビタブル惑星の検出を実現しうる波長帯域の広いYバンドのコムを実現し、実際の惑星探査研究への利用の道筋をつけた。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (11 results)

All 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results) Remarks (2 results)

  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Korea University(韓国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Dual optical frequency combs with ultra-low relative phase jitters from 550 nm to 1020 nm for precision spectroscopy2022

    • Author(s)
      Chae Eunmi、Nakashima Kota、Yoshioka Kosuke
    • Journal Title

      Optics Express

      Volume: 30 Issue: 11 Pages: 18703-18703

    • DOI

      10.1364/oe.458735

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Chirped pulse amplification of an ultrahigh-repetition-rate Ti:sapphire frequency comb using a tapered semiconductor amplifier2021

    • Author(s)
      Takashi Sakamoto, Kosuke Yoshioka
    • Journal Title

      Optics Letters

      Volume: 46 Issue: 18 Pages: 4642-4642

    • DOI

      10.1364/ol.428466

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Compact green Ti:sapphire astro-comb with a 43 GHz repetition frequency2021

    • Author(s)
      Eunmi Chae, Eiji Kambe, Kentaro Motohara, Hideyuki Izumiura, Mamoru Doi, and Kosuke Yoshioka
    • Journal Title

      Journal of the Optical Society of America B

      Volume: 38 Issue: 7 Pages: A1-A1

    • DOI

      10.1364/josab.419078

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 超高繰り返しモード同期固体レーザーによる可視・近赤外天文コムの構築2022

    • Author(s)
      吉岡孝高
    • Organizer
      超高速光エレクトロニクス研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Chirped Pulse Amplification of 1.6 GHz Ti:Sapphire Frequency Comb Using a Tapered Semiconductor Amplifier2021

    • Author(s)
      Takashi Sakamoto, Kosuke Yoshioka
    • Organizer
      2021 Conference on Lasers and Electro-Optics/Europe - European Quantum Electronics Virtual Conferences
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 超高繰り返し光周波数コムの現状2021

    • Author(s)
      吉岡 孝高
    • Organizer
      可視赤外線観測装置技術ワークショップ2021
    • Related Report
      2021 Research-status Report
    • Invited
  • [Remarks] 東京大学 吉岡研究室

    • URL

      http://www.fs.t.u-tokyo.ac.jp/

    • Related Report
      2022 Annual Research Report
  • [Remarks] 東京大学吉岡研究室

    • URL

      http://www.fs.t.u-tokyo.ac.jp/

    • Related Report
      2021 Research-status Report 2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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