Attosecond Science in the sub-keV region

• Project/Area Number: 19H05628
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Review Section: Broad Section D
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: 緑川 克美 国立研究開発法人理化学研究所, 光量子工学研究センター, センター長 (40166070)
• Project Period (FY): 2019-06-26 – 2024-03-31
• Project Status: Granted (Fiscal Year 2023)
• Budget Amount: ¥198,120,000 (Direct Cost: ¥152,400,000、Indirect Cost: ¥45,720,000); Fiscal Year 2023: ¥34,840,000 (Direct Cost: ¥26,800,000、Indirect Cost: ¥8,040,000); Fiscal Year 2022: ¥39,780,000 (Direct Cost: ¥30,600,000、Indirect Cost: ¥9,180,000); Fiscal Year 2021: ¥39,780,000 (Direct Cost: ¥30,600,000、Indirect Cost: ¥9,180,000); Fiscal Year 2020: ¥45,630,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥10,530,000); Fiscal Year 2019: ¥38,090,000 (Direct Cost: ¥29,300,000、Indirect Cost: ¥8,790,000)
• Keywords: 量子エレクトロニクス / アト秒科学 / レーザー工学 / 超高速光化学 / 非線形光学 / 超高速光科学

Outline of Research at the Start

物質中の電子の動きを捉えることができるアト秒パルスレーザーは、物理学、化学、生物・医科学等の基礎科学分野のみならず、超高速電子デバイス等ならびに高性能触媒や人工光合成等の化学・材料等の産業分野においても必須のツールとなるとものと期待されているが、未だに利用できる波長域は、光子エネルギーにして100eV以下の極端紫外（XUV）領域に制限されており、今、その波長域の拡大が切望されている。本課題では、独自に開発した高エネルギー中赤外レーザー光源とルーズフォーカス法を用いることにより、その波長域をサブkeV領域にまで拡張するともに偏光制御を含めた新たな利用法を開拓し、アト秒科学の新たな展開を図る。

Outline of Annual Research Achievements

2021年度までに中心波長800 nmのフェムト秒チタンサファイア（Ti:S）レーザーを励起光としたDC-OPAを用いて1.3から2.0μm帯においてパルス幅 70fsで100mJ級のエネルギーを得ている。2022年度は、シード光およびDC-OPAに改良を加え、この光源のパルス幅をサブ２サイクルにまで圧縮することに成功し，10.4fs，10TWを達成した。さらに、これを用いて高孤立アト秒パルスの発生を行い、観測されたスペクトル形状の変化からCEP依存性を測定した結果、ハーフサイクルカットオフと呼ばれる孤立アト秒パルスに特徴的なスペクトル構造が観測された。これは100mJ級のサブ2サイクル光で発生した高次高調波のハーフサイクルカットオフ（孤立アト秒パルス）の初めての実証である。これらの成果は、従来の孤立アト秒パルスのエネルギーを2から3桁増大させるものであり、アト秒非線形光学やナノイメージング等への応用が期待される。
また、並行してアト秒高調波による軟Ｘ線過渡吸収分光計測のためのビームラインの整備を行い、液体の薄膜ジェットターゲットを開発した。この液体薄膜ジェットは、2本のノズルから噴出された溶液をある角度で交差させる事によりシート状の液流を形成することができる。ノズルの径および交差角度を調整することにより、薄膜の厚さは制御可能である。薄膜の厚さは光学干渉法で計測し、最も薄い領域で約2μmであった。液体ジェットの排気では、気体に比べてターボ分子ポンプへの負荷が大きくなるため、このポンプには新たにチラーを導入し水冷方式とし、大気中での予備実験をもとに真空容器内で動作可能な機構を設計製作した。

Current Status of Research Progress

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

Reason

DC-OPAを用いてパルス幅をサブ２サイクルにまで圧縮することに成功し，10.4fs，10TWを達成した。さらに、これを用いて高次高調波発生を行い、そのCEP依存性の測定から十分なCEP安定性（約200mrad）と孤立アト秒パルスの発生を実証した。これと並行してアト秒高調波による軟Ｘ線過渡吸収分光計測のためのビームラインの整備を行い、液体の薄膜ジェットターゲットを開発した。ターゲットと光源の製作がほぼ計画どおり進行している。

Strategy for Future Research Activity

高調波のカットオフエネルギーの更なる拡張を目指して、励起波長を2μm帯まで長波長化する。これによって、500eV程度までのカットオフエネルギーの拡張が期待される。これと液体の薄膜ジェットターゲットを組み合わせることにより、キラル分子やアミノ酸等の多原子分子の水の窓領域でのアト秒分光に挑戦する。

Assessment Rating

Interim Assessment Comments (Rating)

A: In light of the aim of introducing the research area into the research categories, the expected progress has been made in research.

Research Products

• [Journal Article] 100-mJ class, sub-two-cycle, carrier-envelope phase-stable dual-chirped optical parametric amplification (2022)
  • Author(s): Xu Lu、Xue Bing、Ishii Nobuhisa、Itatani Jiro、Midorikawa Katsumi、Takahashi Eiji J.
  • Journal Title: Optics Letters Volume: 47 Issue: 13 Pages: 3371-3371
  • DOI: 10.1364/ol.455811
  • Peer Reviewed
• [Journal Article] Attosecond Optical and Ramsey-Type Interferometry by Postgeneration Splitting of Harmonic Pulse (2022)
  • Author(s): Takuya Matsubara , Yasuo Nabekawa, Kenichi L. Ishikawa , Kaoru Yamanouchi, and Katsumi Midorikawa
  • Journal Title: Ultrafast Science Volume: 2022 Pages: 9858739-9858739
  • DOI: 10.34133/2022/9858739
  • Peer Reviewed / Open Access
• [Journal Article] Progress on table-top isolated attosecond light sources (2022)
  • Author(s): K. Midorikawa
  • Journal Title: Nature Photonics Volume: 16 Pages: 267-278
  • Peer Reviewed
• [Journal Article] Carrier-envelope phase control of synthesized waveforms with two acousto-optic programmable dispersive filters (2022)
  • Author(s): Y.-C. Lin, K. Midorikawa, Y. Nabkawa, K. Midorikawa
  • Journal Title: Optics Express Volume: 30 Issue: 7 Pages: 10818-10832
  • DOI: 10.1364/oe.447820
  • Peer Reviewed
• [Journal Article] Gigawatt-class, tabletop, isolated-attosecond-pulse light source (2022)
  • Author(s): Xue Bing、Midorikawa Katsumi、Takahashi Eiji J.
  • Journal Title: Optica Volume: 9 Issue: 4 Pages: 360-360
  • DOI: 10.1364/optica.449979
  • Peer Reviewed / Open Access
• [Journal Article] 300 attosecond response of acetylene in two-photon ionization/dissociation processes (2021)
  • Author(s): Matsubara Takuya、Fukahori Shinichi、Loetstedt Erik、Nabekawa Yasuo、Yamanouchi Kaoru、Midorikawa Katsumi
  • Journal Title: Optica Volume: 8 Issue: 8 Pages: 1075-1083
  • DOI: 10.1364/optica.426071
  • Peer Reviewed / Open Access
• [Journal Article] Apparatus for generation of nanojoule-class water-window high-order harmonics (2021)
  • Author(s): Nishimura Kotaro、Fu Yuxi、Suda Akira、Midorikawa Katsumi、Takahashi Eiji J.
  • Journal Title: Review of Scientific Instruments Volume: 92 Issue: 6 Pages: 063001-063001
  • DOI: 10.1063/5.0045342
  • Peer Reviewed
• [Journal Article] A Custom-Tailored Multi-TW Optical Electric Field for Gigawatt Soft-X-Ray Isolated Attosecond Pulses (2021)
  • Author(s): Xue Bing、Tamaru Yuuki、Fu Yuxi、Yuan Hua、Lan Pengfei、Mucke Oliver D.、Suda Akira、Midorikawa Katsumi、Takahashi Eiji J.
  • Journal Title: Ultrafast Science Volume: 2021 Pages: 1-13
  • DOI: 10.34133/2021/9828026
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Characteristics of nonlinear terahertz-wave radiation generated by mid-infrared femtosecond pulse laser excitation (2021)
  • Author(s): K. Shibuya, K. Nawata, Y. Nakajima, Y. Fu, E. J. Takahashi, K. Midorikawa, T. Yasui, H. Minamide
  • Journal Title: Applied Physics Express Volume: 14 Pages: 0920041-0920041
  • Peer Reviewed
• [Journal Article] Ultrafast electron-nuclear wavepacket in O2+ generated and probed with attosecond pulse trains (2020)
  • Author(s): Fukahori Shinichi、Matsubara Takuya、Nabekawa Yasuo、Yamanouchi Kaoru、Midorikawa Katsumi
  • Journal Title: Journal of Physics B: Atomic, Molecular and Optical Physics Volume: 53 Issue: 16 Pages: 164001-164001
  • DOI: 10.1088/1361-6455/ab94cc
  • Peer Reviewed
• [Journal Article] Characterization of polarization gating parameters for attosecond pulse generation using an imaging polarimeter (2020)
  • Author(s): Okino Tomoya、Midorikawa Katsumi
  • Journal Title: Physical Review A Volume: 102 Issue: 2 Pages: 023116-023116
  • DOI: 10.1103/physreva.102.023116
  • Peer Reviewed
• [Journal Article] Optical parametric amplification of sub-cycle shortwave infrared pulses (2020)
  • Author(s): Lin Yu-Chieh、Nabekawa Yasuo、Midorikawa Katsumi
  • Journal Title: Nature Communications Volume: 11 Issue: 1
  • DOI: 10.1038/s41467-020-17247-9
  • Peer Reviewed
• [Journal Article] High efficiency ultrafast water-window harmonic generation for single-shot soft X-ray spectroscopy (2020)
  • Author(s): Fu Yuxi、Nishimura Kotaro、Shao Renzhi、Suda Akira、Midorikawa Katsumi、Lan Pengfei、Takahashi Eiji J.
  • Journal Title: Communications Physics Volume: 3 Issue: 1
  • DOI: 10.1038/s42005-020-0355-x
  • Peer Reviewed / Open Access
• [Journal Article] Optimization of a multi-TW few-cycle 17-μm source based on Type-I BBO dual-chirped optical parametric amplification (2020)
  • Author(s): Xu Lu、Nishimura Kotaro、Suda Akira、Midorikawa Katsumi、Fu Yuxi、Takahashi Eiji J.
  • Journal Title: Optics Express Volume: 28 Issue: 10 Pages: 15138-15138
  • DOI: 10.1364/oe.392045
  • Peer Reviewed
• [Journal Article] Fully stabilized multi-TW optical waveform synthesizer: Toward gigawatt isolated attosecond pulses (2020)
  • Author(s): B. Xue, Y. Tamaru, Y. Fu, H. Yuan, P. Lan, O. D. Mueck, A. Suda, K. Midorikawa, and E. J. Takahashi
  • Journal Title: Science Advances Volume: 6 Issue: 16
  • DOI: 10.1126/sciadv.aay2802
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Dual-Chirped Optical Parametric Amplification: A Method for Generating Super-Intense Mid-Infrared Few-Cycle Pulses (2019)
  • Author(s): Y. Fu, K. Midorikawa, and E. J. Takahashi
  • Journal Title: IEEE Journal of Selected Topics in Quantum Electronics Volume: 25 Issue: 4 Pages: 1-13
  • DOI: 10.1109/jstqe.2019.2925720
  • Peer Reviewed
• [Journal Article] At wavelength coherent scatterometry microscope using high-order harmonics for EUV mask inspection (2019)
  • Author(s): Nagata Yutaka、Harada Tetsuo、Watanabe Takeo、Kinoshita Hiroo、Midorikawa Katsumi
  • Journal Title: International Journal of Extreme Manufacturing Volume: 1 Issue: 3 Pages: 032001-032001
  • DOI: 10.1088/2631-7990/ab3b4e
  • Peer Reviewed / Open Access
• [Presentation] The third-generation table-top attosecond light sources (2023)
  • Author(s): K. Midorikawa
  • Organizer: Ultrafast Optics XIII
  • Int'l Joint Research / Invited
• [Presentation] Generation of sub-cycle shortwave infrared optical vortex pulses (2023)
  • Author(s): Yu-Chieh Lin, Y. Nabekawa, K. Midorikawa
  • Organizer: The 43rd Annual Meeting of The Laser Society of Japan
• [Presentation] Development of multifragment 3D ion momentum imaging methods for investigating ultrafast dynamics of polyatomic molecules (2022)
  • Author(s): T. Okino, K. Midorikawa
  • Organizer: International Symposium on Ultrafast Intense Laser Science (ISUILS2022)
  • Int'l Joint Research / Invited
• [Presentation] Multiscale Ion Momentum Imaging: Investigating Ultrafast Dynamics of Polyatomic Molecules (2022)
  • Author(s): T. Okino, K. Midorikawa
  • Organizer: 12th Asian Symposium on Intense Laser Science (ASILS12)
  • Int'l Joint Research / Invited
• [Presentation] Observation of XUV induced ultrafast dynamics by attosecond pulse trains (2022)
  • Author(s): K. Midorikawa
  • Organizer: 12th Asian Symposium on Intense Laser Science (ASILS12)
  • Int'l Joint Research / Invited
• [Presentation] Attosecond Control of Simple Molecules and Atoms Using XUV High-harmonic Pulse Pairs (2022)
  • Author(s): Y. Nabekawa
  • Organizer: ANSO Symposium on Basic Science for Sustainable Development
  • Int'l Joint Research / Invited
• [Presentation] Increase in photon flux of isolated att-second pulses (2022)
  • Author(s): K. Midorikawa
  • Organizer: 8th International Conference on Attosecond Science and Technology (ATTO VIII)
  • Int'l Joint Research / Invited
• [Presentation] Optical Parametric Amplification of sub-Cycle Shortwave Infrared Pulses (2022)
  • Author(s): Yu-Chieh Lin, Y. Nabekawa, K. Midorikawa,
  • Organizer: Conference on Lasers and Electro-Optics (CLEO) 2022
  • Int'l Joint Research / Invited
• [Presentation] 100 mJ, sub-two-cycle, CEP stable 1.7 um laser based on DC-OPA (2022)
  • Author(s): L. Xu, B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: The 1st International conference on Ultrafast X
  • Int'l Joint Research / Invited
• [Presentation] Recent progress of isolated attosecond pulses (2022)
  • Author(s): K. Midorikawa
  • Organizer: The 1st International conference on Ultrafast X
  • Int'l Joint Research / Invited
• [Presentation] Attosecond optical and Ramsey-type interferometry by post-generation splitting of high-order harmonic pulses (2022)
  • Author(s): T. Matsubara, Y. Nabekawa, K. L. Ishikawa, K. Yamanouchi, K. Midorikawa
  • Organizer: International Symposium on Ultrafast Intense Laser Science (ISUILS2022)
  • Int'l Joint Research
• [Presentation] Capturing x-ray induced nonradiative decay dynamics by femtosecond X-ray transient absorption spectroscopy (2022)
  • Author(s): K. Yamazaki, K. Midorikawa
  • Organizer: IWP-RIXS-2022
  • Int'l Joint Research
• [Presentation] Carrier-envelope phase-dependent high harmonic generation via loosely focused 10-TW sub-two-cycle pulses (2022)
  • Author(s): L. Xu, B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: International Conference on Ultrafast Phenomena 2022
  • Int'l Joint Research
• [Presentation] Giant isolated attosecond pulse generated on a tabletop (2022)
  • Author(s): B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: International Conference on Ultrafast Phenomena 2022
  • Int'l Joint Research
• [Presentation] Arbitrary carrier-envelope phase control of over-octave-spanning synthesized waveform using multiple AOPDFs (2022)
  • Author(s): Yu-Chieh Lin, Y. Nabekawa, K. Midorikawa
  • Organizer: The 11th Advanced Lasers and Photon Sources
  • Int'l Joint Research
• [Presentation] Development of an optical parametric amplifier laser system delivering CEP-stabilized sub-cycle pulses in SWIR region (2022)
  • Author(s): Yu-Chieh Lin, Y. Nabekawa, K. Midorikawa
  • Organizer: the 70th JSAP spring meeting 2022
• [Presentation] Computational research on diffraction imaging using attosecond sources, (2022)
  • Author(s): G. N. Tran, K. Midorikawa, E. J. Takahashi
  • Organizer: the 70th JSAP spring meeting 2022
• [Presentation] フェムト秒Ｘ線誘起非断熱反応過程追跡のための Ｘ線2色ポンプ・プローブ分光法 (2022)
  • Author(s): 山崎 薫、緑川克美
  • Organizer: 第16回分子科学討論会
• [Presentation] イベント駆動型イメージセンサーを用いた運動量画像計測装置の開発 (2022)
  • Author(s): 沖野友哉、緑川克美
  • Organizer: 第16回分子科学討論会
• [Presentation] Attosecond optical and Ramsey-type interferometry by post-generation splitting of high-order harmonic pulse (2022)
  • Author(s): T. Matsubara, Y. Nabekawa, K. L. Ishikawa, K. Yamanouchi, K. Midorikawa
  • Organizer: 第16回分子科学討論会
• [Presentation] Temporal characterization of gigawatt isolated attosecond pulses with the overall all-optical FROG-CRAB (2022)
  • Author(s): B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: The 83rd JSAP Autumn Meeting 2022
• [Presentation] Carbon KLL normal Auger induced femtosecond nonadiabatic reaction dynamics in tropone dication (C7H6O2+) (2022)
  • Author(s): K. Yamazaki, K. Midorikawa
  • Organizer: 第37回化学反応討論会
• [Presentation] Development of multiplex ion momentum imaging methods for investigating ultrafast molecular dynamics of polyatomic molecules (2022)
  • Author(s): T. Okino, K. Midorikawa
  • Organizer: International Symposium on Recent Development in Atomic, Molecular, and Optical Science 2022
  • Int'l Joint Research / Invited
• [Presentation] Realization of Compact GW-Scale Soft x-ray Isolated Attosecond Pulses (2022)
  • Author(s): B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: High-Intensity Lasers and High-Field Phenomena (HILAS)
  • Int'l Joint Research / Invited
• [Presentation] 02 mJ a few-cycle IR laser system based on BiBO dual-chirped optical parametric amplification (2022)
  • Author(s): L. Xu, B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: High-Brightness Sources and Light-Driven Interactions Congress 2022
  • Int'l Joint Research
• [Presentation] 高次高調波を用いた極端紫外域におけるアト秒分光 (2022)
  • Author(s): 鍋川康夫、松原卓也、石川顕一、山内薫、緑川克美
  • Organizer: レーザー学会学術講演会第42回年次大会,
  • Invited
• [Presentation] A CEP stable, sub-two-cycle, over 100 mJ IR DC-OPA: Towards a sub-microjoule water window isolated attosecond (2022)
  • Author(s): L. Xu, B. Xue, K. Midorikawa, E. J. Takahashi
  • Organizer: The 69th JSAP Spring Meeting
• [Presentation] Stabilization of carrier-envelope phase with multiple acousto-optic programmable dispersive filters (2022)
  • Author(s): Yu-Chieh Lin, K. Midorikawa, Y. Nabekawa
  • Organizer: The 69th JSAP Spring Meeting
• [Presentation] 高次高調波を用いたアト秒光学干渉およびラムゼー干渉計測 (2022)
  • Author(s): 松原卓也、鍋川康夫、石川顕一、山内薫、緑川克美
  • Organizer: レーザー学会学術講演会第42回年次大会
• [Presentation] CEP control of over-octave-spanning synthesized spectra using multiple AOPDFs (2022)
  • Author(s): Yu-Chieh Lin, 鍋川康夫、緑川克美
  • Organizer: レーザー学会学術講演会第42回年次大会
• [Presentation] Generation of GW isolated attosecond pulses by high-energy multi-color optical synthesizer (2021)
  • Author(s): K. Midorikawa
  • Organizer: International Symposium on Ultrafast Intense Laser Science Online V,
  • Int'l Joint Research / Invited
• [Presentation] Multi-TW optical waveform synthesizer for generating GW isolated attosecond pulses (2021)
  • Author(s): K. Midorikawa
  • Organizer: The 4th Int. Symposium on High Power Laser Science and Engineering
  • Int'l Joint Research / Invited
• [Presentation] ttosecond optical and Ramsey-type interference (2021)
  • Author(s): T. Matsubara, Y. Nabekawa, K. L. Ishikawa, K. Yamanouchi, K. Midorikawa
  • Organizer: CLEO/EUROPE-EQEC 2021
  • Int'l Joint Research
• [Presentation] Multi-fragment momentum imaging of polyatomic molecules using an electro-optic light modulator and an imaging polarimeter (2021)
  • Author(s): T. Okino, K. Midorikawa
  • Organizer: 32nd International Conference on Photonic, Electronic and Atomic Collisions (ICPEAC2021)
  • Int'l Joint Research
• [Presentation] マルチフラグメント3次元運動量画像法の開発 (2021)
  • Author(s): 沖野友哉、緑川克美
  • Organizer: 第82回応用物理学会秋季学術講演会
• [Presentation] 多原子分子の超高速ダイナミクス追跡のためのマルチフラグメント運動量画像法の開発 (2021)
  • Author(s): 沖野友哉、緑川克美
  • Organizer: 光・量子デバイス研究会「革新的材料の創出とデバイス応用」
• [Presentation] X-ray induced femtosecond ionization kinetics of tropone (C7H6O) at carbon K-edge (2021)
  • Author(s): K. Yamazaki, K. Midorikawa
  • Organizer: 第36回化学反応討論会
• [Presentation] Development of M-cubed momentum imaging for investigating ultrafast molecular dynamics of polyatomic molecules (2021)
  • Author(s): T. Okino, K. Midorikawa
  • Organizer: 第36回化学反応討論会
• [Presentation] Single-shot spatially-resolved carrier-envelope phase measurement of femtosecond laser pulses using an imaging polarimeter (2021)
  • Author(s): T. Okino, K. Midorikawa
  • Organizer: 第36回化学反応討論会
• [Presentation] 軟Ｘ線高次高調波の現状と展開 (2021)
  • Author(s): 高橋栄治
  • Organizer: 第68回応用物理学会春期学術講演会
  • Invited
• [Presentation] 高強度アト秒パルス発生用光シンセサイザーの開発 (2021)
  • Author(s): 高橋栄治、B. Xue
  • Organizer: レーザー学会学術講演会第41回年次大会
  • Invited
• [Presentation] ストークスパラメーター計測による偏光ゲート法の特性評価 (2021)
  • Author(s): 沖野友哉、緑川克美
  • Organizer: レーザー学会学術講演会第41回年次大会
• [Presentation] Multi-TW, CEP-stable, a few-cycle 1.6 um pulse from BiBO dual-chirped optical parametric amplification (2021)
  • Author(s): 徐 露、石井 順久、緑川克美、高橋栄治
  • Organizer: レーザー学会学術講演会第41回年次大会
• [Presentation] 円偏光高次高調波発生における励起レーザー波長依存性 (2021)
  • Author(s): 西村光太郎、Xue Bing、須田亮、緑川克美、高橋栄治
  • Organizer: レーザー学会学術講演会第41回年次大会
• [Presentation] Generation of GW isolated attosecond pulses by high-energy optical waveform synthesizer (2020)
  • Author(s): K. Midorikawa
  • Organizer: Advance in Atomic, Molecular and Optical Science 2020
  • Int'l Joint Research / Invited
• [Presentation] High-energy mid-infrared femtosecond pulses for attosecond science, (2020)
  • Author(s): E. J. Takahashi
  • Organizer: The 22nd International Conference on Ultrafast Phenomena
  • Int'l Joint Research / Invited
• [Presentation] Multi-TW optical waveform synthesizer for gigawatt soft-x-ray isolated attosecond pulses (2020)
  • Author(s): E. J. Takahashi
  • Organizer: CELEO/PacificRim2020
  • Int'l Joint Research / Invited
• [Presentation] Dual-chirped optical parametric amplification for energy scaling of near-IR, mid-IR and far-IR pulses (2020)
  • Author(s): E. J. Takahashi
  • Organizer: Conference on Lasers and Electro-Optics (CLEO)2020
  • Int'l Joint Research / Invited
• [Presentation] 光科学の新たな地平を拓く (2020)
  • Author(s): 緑川克美
  • Organizer: 物理学会公開講座
  • Invited
• [Presentation] Demonstration of a Nano-Joule Class Water Window High Harmonic Light Source (2020)
  • Author(s): Kotaro Nishimura, Lu Xu, Akira Suda, Katsumi Midorikawa, Yuxi Fu, Eiji J. Takahashi
  • Organizer: High-brightness Sources and Light-driven Interactions Congress
  • Int'l Joint Research
• [Presentation] Characterization of Attosecond Pulse Train and Nonlinear Fourier Transform Spectroscopy in Dissociative Ionization of Acetylene (2020)
  • Author(s): T. Matsubara, S. Fukahori, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: The 22nd International Conference on Ultrafast Phenomena
  • Int'l Joint Research
• [Presentation] Stabilization of Mach Zehnder Interferometer in a sub-cycle shortwave-infrared OPA system (2020)
  • Author(s): Y.-C. Lin, Y. Nabekawa, K. Midorikawa
  • Organizer: The 22nd International Conference on Ultrafast Phenomena
  • Int'l Joint Research
• [Presentation] A Robust Scaling Up Method of Output Energy and Photon Energy on High-Order Harmonic Generation: Towards Sub-μJ Water Window Soft X-rays (2020)
  • Author(s): K. Nishimura, L. Xu, A. Suda, K. Midorikawa, Y. Fu, E. J. Takahashi
  • Organizer: Conference on Lasers and Electro-Optics 2020
  • Int'l Joint Research
• [Presentation] Nonlinear Fourier Transform Spectroscopy of Acetylene by Intense Attosecond Pulse Trains (2020)
  • Author(s): T. Matsubara, S. Fukahori, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: 第13回分子科学討論会
• [Presentation] Progress on high-order harmonics and attosecond pulses (2019)
  • Author(s): K. Midorikawa
  • Organizer: 14th Asia Pacific Physics Conference
  • Int'l Joint Research / Invited
• [Presentation] Generation of GW isolated attosecond pulses by multi-TW optical waveform synthesizer (2019)
  • Author(s): K. Midorikawa
  • Organizer: The 11th Asian Symposium on Intense Laser Science
  • Int'l Joint Research / Invited
• [Presentation] Attosecond Science and Application (2019)
  • Author(s): K. Midorikawa
  • Organizer: International Symposium on Ultrafast Intense Laser Science 2019
  • Int'l Joint Research / Invited
• [Presentation] Energy scaling of sub-keV attosecond pulse driven by strong mid-infrared femtosecond laser (2019)
  • Author(s): 5.Y. Fu, K. Nishimura, B. Xue, H. Yuan, P. Lan, K. Midorikawa, E. J. Takahashi
  • Organizer: International Symposium on Ultrafast Intense Laser Science 2019
  • Int'l Joint Research / Invited
• [Presentation] Gigawatt soft-x-ray attosecond super-continuum (2019)
  • Author(s): E. J. Takahashi
  • Organizer: The 11th International Conference on Information Optics and Photonics
  • Int'l Joint Research / Invited
• [Presentation] 超高速軟X 線イメージングを拓く高次高調波光源 (2019)
  • Author(s): 高橋栄治
  • Organizer: 第67回応用物理学会春季学術講演会
  • Invited
• [Presentation] 二重チャープ光パラメトリック増幅によるテラワット級中赤外レーザーシステムの開発 (2019)
  • Author(s): 高橋栄治
  • Organizer: レーザー学会学術講演会第40回年次大会
  • Invited
• [Presentation] 超短パルスレーザーで物質内の電子の動きを観る (2019)
  • Author(s): 沖野友哉
  • Organizer: JSTさきがけ「光極限」公開セミナー
  • Invited
• [Presentation] 高次高調波発生を用いた MCD 計測用光源の開発 (2019)
  • Author(s): 高橋栄治
  • Organizer: 第43回 日本磁気学会学術講演会
  • Invited
• [Presentation] フルコヒーレント・アト秒軟 X 線光源の高強度化と展開 (2019)
  • Author(s): 高橋栄治
  • Organizer: 第80回応用物理学会秋季学術講演会
  • Invited
• [Presentation] Sub-optical-cycle shortwave infrared pulses generation in a cascaded degenerate optical parametric amplifier (2019)
  • Author(s): Y.-C. Lin, Y. Nabekawa, K. Midorikawa
  • Organizer: Ultrafast Optics XII 2019
  • Int'l Joint Research
• [Presentation] Nonlinear Fourier transform spectroscopy of acetylene by intense attosecond pulse trains (2019)
  • Author(s): T. Matsubara, S. Fukahori, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: International Symposium on Ultrafast Intense Laser Science 2019
  • Int'l Joint Research
• [Presentation] Nonlinear Fourier Transform Spectroscopy of Acetylene by Intense Attosecond Pulse Trains (2019)
  • Author(s): T. Matsubara, S. Fukahori, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: 7th International Conference on Attosecond Science and Technology
  • Int'l Joint Research
• [Presentation] Nonlinear Fourier Transform Spectroscopy of O2 with Intense Attosecond Pulse Trains (2019)
  • Author(s): S. Fukahori, T. Matsubara, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: 7th International Conference on Attosecond Science and Technology
  • Int'l Joint Research
• [Presentation] 多原子分子ダイナミクス計測のためのマルチフラグメント運動量画像法の開発 (2019)
  • Author(s): 沖野友哉、緑川克美
  • Organizer: 分子科学討論会2019
• [Presentation] Dissociative ionization of O2 via B2Σg and 3 2Πu states of O2+ induced by intense XUV attosecond pulse trains (2019)
  • Author(s): S. Fukahori, T. Matsubara, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: 第35回科学反応討論会
• [Presentation] Dissociative ionization of O2 via B2Σg and 3 2Πu states of O2+ induced by intense XUV attosecond pulse trains (2019)
  • Author(s): S. Fukahori, T. Matsubara, Y. Nabekawa, K. Yamanouchi, K. Midorikawa
  • Organizer: 第13回分子科学討論会2019