デュアルコム分光を用いた高分解能ラマン分光法の開発と展開

2018 Fiscal Year Research-status Report

• Project/Area Number: 17K14435
• Research Institution: The University of Electro-Communications
• Principal Investigator: 西山 明子 電気通信大学, 大学院情報理工学研究科, 特別研究員 (00770364)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: デュアルコム分光 / ラマン / 共振器分光法 / 高感度 / 高強度レーザー

Outline of Annual Research Achievements

本研究の目的は、デュアルコム分光法を気相分子の高分解能ラマン分光に応用し、赤外吸収分光法とは異なる選択則の振動遷移を光周波数コムが持つ究極の周波数精度で測定し、分子の振動励起状態ダイナミクスを明らかにすることである。デュアルコム分光法を気相分子のラマン分光に適用するためには測定感度の向上が必要であったため、前年度から引き続き、光コム分光法の高感度化の研究を行った。高フィネス共振器を用いた共振器分光法によって、非常に弱い遷移であるCO気体の倍音遷移の吸収スペクトルを観測することに成功した。この共振器分光法は吸収分光法のみならず、ラマン分光法を含む非線形分光法への適用が可能である。また、ラマン分光法において十分な信号強度を得るために、高出力な光源を用いることが望ましい。そこで本年度には、モード同期Yb添加ファイバレーザーとチャープパルス増幅を用いた光増幅器の開発を開始し、レーザー開発における基礎的なデータを取り終えた。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

本年度には、光コム分光法をラマン分光に適用するために重要である測定感度の向上に取り組み、成果を上げた。また、より強い信号を得るための高強度レーザーの開発は順調に進んでいる。研究実施場所を移したため、モード同期Er添加ファイバレーザーによるデュアルコム分光システムを用いる当初の計画は変更せざるを得ないものの、1台の光周波数コムを用いてデュアルコム分光法と同等の高分解能を得ることが可能な高分解能フーリエ変換分光装置の研究も並行して行っており、これを高分解能ラマン分光法に適用できる見通しである。これらの理由から、本研究はおおむね順調に進捗しているといえる。

Strategy for Future Research Activity

3年間の研究予定であったが、研究代表者の異動による応募資格喪失によって2年間での終了となった。

Research Products

• [Journal Article] 光周波数コムを光源とした高分解能フーリエ変換分光法と高感度共振器分光への応用 (2018)
  • Author(s): 西山 明子, Dominik Charczun, Grzegorz Kowzan, Piotr Maslowsk
  • Journal Title: 分光研究 Volume: 67 Pages: 157-160
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Cavity-Enhanced Direct Optical Frequency Comb Spectroscopy with Tooth-Width Limited Resolution (2019)
  • Author(s): D. Charczun, G. Kowzan, A. Nishiyama, A. Cygan, R. S. Trawinski, D. Lisak, P. Maslowski
  • Organizer: CLEO 2018 (Conference on Lasers and Electro-Optics)
  • Int'l Joint Research
• [Presentation] Stabilized All-Fiber-Based Mode-Filtering Technique for the Generation of a GHz-Repetition-Rate Frequency Comb (2019)
  • Author(s): Yoshiaki Nakajima, Takuya Hariki, Akiko Nishiyama, Kaoru Minoshima
  • Organizer: CLEO 2019 (Conference on Lasers and Electro-Optics)
  • Int'l Joint Research
• [Presentation] Comb-based Fourier-Transform Spectrometry for Broadband Measurements of Absorption and Dispersion (2019)
  • Author(s): D. Charczun, G. Kowzan, A. Nishiyama, P. Staniszewski, A. Cygan, R. S. Trawinski, D. Lisak, P. Maslowski
  • Organizer: CLEO/Europe-EQEC 2019, Germany, June, 2019
  • Int'l Joint Research
• [Presentation] Cavity-Enhanced Direct Optical Frequency Comb Spectroscopy with Tooth-Width Limited Resolution (2019)
  • Author(s): G. Kowzan, D. Charczun, A. Nishiyama, P. Staniszewski, A. Cygan, R. S. Trawinski, D. Lisak, P. Maslowski
  • Organizer: 13th Europian conference on atoms, molecules and photons (ECAMP13)
  • Int'l Joint Research
• [Presentation] Highly Sensitive and Broadband Frequency Comb Spectroscopy Using a High Finesse Cavity (2019)
  • Author(s): A. Nishiyama, G. Kowzan, D. Charczun, P. Staniszewski, A. Cygan, R. S. Trawinski, D. Lisak, P. Maslowski
  • Organizer: The 3rd Asian workshop on molecular spectroscopy (AWMS)
  • Int'l Joint Research / Invited
• [Presentation] Accurate measurement of helium-perturbed deuterium spectra for collisional studies and validation of the ab initio potential energy surfaces (2019)
  • Author(s): A. Nishiyama, F. Thibault, M. Slowinski, M. Zaborowski, N. Stolarczyk, D. Charczun, A. Cygan, S. Wojtewicz, G. Kowzan, P. Maslowski, R. Ciurylo, D. Lisak, P. Wcislo
  • Organizer: The 3rd Asian workshop on molecular spectroscopy (AWMS)
  • Int'l Joint Research
• [Presentation] 光周波数コムを用いた高分解能・高感度分子分光の研究 (2019)
  • Author(s): 西山明子
  • Organizer: 第66回応用物理学会春季学術講演会
  • Invited
• [Presentation] 光周波数コムを用いたCO気体の高感度分光計測 (2018)
  • Author(s): 西山明子, Grzegorz Kowzan, Dominik Charczun, Piotr Maslowsk
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Sub-MHz deuterium spectroscopy and comparison with ab initio calculations of the line-shape effects (2018)
  • Author(s): M. Zaborowski, F. Thibault, S. Wojtewicz, A. Cygan, G. Kowzan, P. Maslowski, M. Slowinski, A. Nishiyama, N. Stolarczyk, D. Lisak, R. Ciurylo, P. Wcislo
  • Organizer: The 25th High resolution molecular spectroscopy (HRMS)
  • Int'l Joint Research
• [Presentation] Line Shape Study of the Second Overtone Band of CO Using Cavity-Enhanced Comb-Based Fourier-Transform Spectroscopy (2018)
  • Author(s): A. Nishiyama, G. Kowzan, D. Charczun, V. S. de Oliveira, A. Ruehl, I. Hartl, K. Minoshima, R. S. Trawinski, P. Maslowski
  • Organizer: European Group Atomic Systems (EGAS)
  • Int'l Joint Research
• [Presentation] Hz-level Resolution Fourier Transform Spectrometry for Complex Refractive Index Spectroscopy (2018)
  • Author(s): D. Charczun, G. Kowzan, A. Nishiyama, M. Debus, P. Huke, D. Tomaszewska, G. Sobon, A. Cygan, D. Lisak, R. S. Trawinski, P. Maslowski
  • Organizer: European Group Atomic Systems (EGAS)
  • Int'l Joint Research
• [Presentation] High-accuracy deuterium spectroscopy and comparison with ab initio line-shape calculations (2018)
  • Author(s): M. Zaborowski, F. Thibault, S. Wojtewicz, A. Cygan, G. Kowzan, P. Maslowski, M. Slowinski, A. Nishiyama, N. Stolarczyk, D. Lisak, R. Ciurylo, P. Wcislo
  • Organizer: European Group Atomic Systems (EGAS)
  • Int'l Joint Research
• [Presentation] Line Shape Measurements of CO Using Frequency Comb Based Cavity-Enhanced Absorption Spectroscopy (2018)
  • Author(s): Akiko Nishiyama, Grzegorz Kowzan, Dominik Charczun, Vinicius Silva de Oliveira, Axel Ruehl, Ingmar Hartl, Kaoru Minoshima, Ryszard S. Trawinski, Piotr Maslowski
  • Organizer: Advanced Photonics 2018 Congress
  • Int'l Joint Research
• [Presentation] Fourier-Transform Frequency Comb Cavity Mode Spectroscopy at Hz Level for Trace Gas Measurements (2018)
  • Author(s): Dominik Charczun, Grzegorz Kowzan, Akiko Nishiyama, Michael Debus, Philipp Huke, Dorota Tomaszewska, Grzegorz Sobon, Agata Cygan, Daniel Lisak, Ryszard Trawinski, Piotr Maslowski
  • Organizer: Advanced Photonics 2018 Congress
  • Int'l Joint Research
• [Presentation] FOURIER-TRANSFORM COMPLEX REFRACTIVE INDEX SPECTROSCOPY AT Hz-LEVEL WITH OPTICAL FREQUENCY COMBS (2018)
  • Author(s): Dominik Charczun, Grzegorz Kowzan, Akiko Nishiyama, Agata Cygan, Daniel Lisak, Ryszard Trawinski, Piotr Maslowski
  • Organizer: 73rd International Symposium of Molecular Spectroscopy 2018
  • Int'l Joint Research
• [Presentation] Accurate Line Shape Measurement of D2-He and Comparison with ab initio Calculation (2018)
  • Author(s): A. Nishiyama, F. Thibault, M. Slowinski, M. Zaborowski, N. Slolarczyk, D. Charczun, A. Cygan, S. Wojtewicz, G. Kowzan, P. Maslowski, R. Ciurylo, D. Lisak, P. Wcislo
  • Organizer: International Conference on Spectral Line Shapes 2018
  • Int'l Joint Research
• [Presentation] Application of Cavity-Enhanced Comb-Based Fourier-Transform Spectroscopy to Line Shape Study of Carbon Monoxide in Argon (2018)
  • Author(s): A. Nishiyama, G. Kowzan, D. Charczun, V. Oliveira, A. Ruehl, I. Hartl, K. Minoshima, R. Trawinski, P. Maslowski
  • Organizer: CLEO 2018 (Conference on Lasers and Electro-Optics)
  • Int'l Joint Research
• [Presentation] High-Sensitivity Doppler-Free Optical-Optical Double-Resonance Dual-Comb Spectroscopy (2018)
  • Author(s): A. Nishiyama, K. Nakagawa, H. Sasada, A. Onae, Y. Nakajima, K. Minoshima
  • Organizer: CLEO 2018 (Conference on Lasers and Electro-Optics)
  • Int'l Joint Research
• [Presentation] All-fiber-based mode-filtering technique with high side-mode suppression ratio and high multiplication factor (2018)
  • Author(s): Yoshiaki Nakajima, Akiko Nishiyama, Takuya Hariki, Kaoru Minoshima
  • Organizer: CLEO 2018 (Conference on Lasers and Electro-Optics)
  • Int'l Joint Research