Attosecond Science Research Team

Team Leader

Katsumi Midorikawa


Katsumi Midorikawa


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wtakiko [at]

Attosecond Science Research Team,
RIKEN Center for Advanced Photonics

2-1 Hirosawa, Wako, Saitama 351-0198 Japan

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Nonlinear optical process in the XUV region is of paramount importance not only in the field of quantum electronic but also in ultrafast optics. From the viewpoint of quantum electronics, new features of the interaction between intense XUV photons and matters are expected to be revealed through observation of those nonlinear phenomena. On the other hand, those nonlinear processes in the XUV region is indispensable for progress of attosecond science including attosecond atomic/molecular physics and chemistry, because it is very useful for investigating ultrafast phenomena directly in attosecond time scale. Using high harmonic generation by intense femtosecond laser technology, we are pursuing extreme optical science including XUV nonlinear optics and attosecond physics/chemistry.


Interdisciplinary Science and Engineering, Physics, Engineering


Attosecond Science, Ultrafast Lasers, Strong Field Physics, Nonlinear Optics、Multiphoton Microscopy


  1. Generation and measurement of attosecond pulses
  2. Attosecond dynamics in atoms and molecules
  3. XUV nonlinear optics
  4. Ultrashort intense laseers
  5. Multiphoton microscopy
High-energy three-color optical waveform synthesizer for generating GW isolated attosecond pulses

High-energy three-color optical waveform synthesizer for generating GW isolated attosecond pulses

Selected Publications

  1. Kanda, N., Imahoko, T., Yoshida, K., Tanabashi, A., Eilanlou, A. A., Nabekawa, Y., Sumiyoshi, T., Kuwata-Gonokami, M., and Midorikawa, K.: "Opening a new route to multiport coherent XUV sources via intracavity high-order harmonic generation”, Light: Sci & Appl. 9, 168 (2020).
  2. Lin, Y-C., Nabekawa, Y., and Midorikawa, K.: “Optical parametric amplification of sub-cycle shortwave infrared pulses” , Nat. Commun. 11, 3413 (2020).
  3. Fu, Y., Nishimura, K., Shao, R., Susa, A., Midorikawa, K., Lan, P., and Takahashi, E. J.: “High efficiency ultrafast water-window harmonic generation for single-shot soft x-ray spectroscopy” , Commun. Phys. 3, 92 (2020).
  4. Xue, B., Tamaru, Y., Yuan, H., Lan, P., Mücke, O. D., Suda, A., Midorikawa, K., and Takahashi, E. J.: “Fully stabilized multi-TW optical waveform synthesizer: Toward gigawatt isolated attosecond pulses” , Science Advances 6, eaay2820 (2020).
  5. Nagata, Y., Harada, T., Watanabe, T., Kinoshita, H., and MidorikawaK.: “At wavelength coherent scatterometry microscope using high-order harmonics for EUV mask inspection”, Int. J. Extrem. Manuf. 1, 032001 (2019).


Katsumi MidorikawaTeam Leader
Tohru KobayashiSpecial Temporary Research Scientist
Yutaka NagataSenior Research Scientist 
Yasuo NabekawaSenior Research Scientist
Eiji TakahashiSenior Research Scientist
Takayuki MichikawaResearch Scientist
Tomoya OkinoResearch Scientist
Keisuke IsobeResearch Scientist
Takashige FujiwaraResearch Scientist
Yu-Chieh LinResearch Scientist
Kaoru YamazakiResearch Scientist
Akihiro TanabashiTechnical Scientist
Takiko WakabayashiSpecial Temporary Employee
Bing XueSpecial Postdoctoral Researcher
Lu XuPostdoctoral Researcher
Giang Nahan TranPostdoctoral Researcher
Tomohiro IshikawaJunior Research Associate
Kotaro NishimuraJunior Research Associate