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Chief Scientist Laboratories Extreme Laser Science Laboratory

Chief Scientist: Eiji J. Takahashi (D. Eng.)

Research Summary

Eiji J. Takahashi(D. Eng.)

Laser is highly controllable light, and by using various laser technologies, we can create optical pulses with arbitrary electric field shape, pulse duration, and beam shape. The main research goal of our laboratory is to extend the wavelength range of coherent light sources up to hard x-ray by using the extreme nature of laser light, such as ultra-short pulse duration, ultra-broadband wavelength, and ultra-high intensity. Through the development of novel laser technologies, we demonstrate extreme laser sources useful for strong-field physics and extend the frontier of laser science.

Main Research Fields

  • Engineering

Related Research Fields

  • Complex Systems
  • Interdisciplinary Science & Engineering
  • Optical engineering and photon science-related
  • Quantum beam science-related
  • optical properties of condensed matter and atomic physics-related


  • Femtosecond lasers and amplifiers
  • High-intensity optical waveform synthesizer
  • High-intensity laser science
  • Attosecond science
  • Next-generation quantum beam sources

Selected Publications

  • 1. Lu. X. and Takahashi, E.J.:
    "Dual-chirped optical parametric amplification of high-energy single-cycle laser pulses"
    Nature Photonics 18, 99-106 (2024).
  • 2.Bing, X., Midorikawa, K., and Takahashi, E.J.:
    "Gigawatt-class, tabletop, isolated-attosecond-pulse light source"
    Optica 9, 360-363 (2022).
  • 3.Lu, X., Bing, X., Ishii, N., Itatani, J., Midorikawa, and Takahashi, E.J.:
    "100-mJ class, sub-two-cycle, carrier-envelope phase-stable dual-chirped optical parametric amplification"
    Opt. Lett. 47, 3371-3374 (2022).
  • 4.Bing, X., Tamaru, Y., Fu, Y., Yuan, H., Lan, P., Mucke, O.D., Suda, A., Midorikawa, K., and Takahashi, E.J.:
    "A Custom-Tailored Multi-TW Optical Electric Field for Gigawatt Soft-X-Ray Isolated Attosecond Pulses."
    Ultrafast Science 2021, 1-13 (2021).
  • 5.Bing, X., Tamaru, Y., Fu, Y., Yuan, H., Lan, P., Mucke, 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: eaay2802. (2020).
  • 6.Yuxi, F., Nishimura, K., Shao, R., Suda, A., Midorikawa, K., Lan, P., and Takahashi, E.J.:
    "High efficiency ultrafast water-window harmonic generation for single-shot soft X-ray spectroscopy"
    Communications Physics, 3: 92. (2020).
  • 7.Lu, X., Nishimura, K., Suda, A., Midorikawa, K., Fu, Y., and Takahashi, E.J.:
    "Optimization of a multi-TW few-cycle 17-μm source based on Type-I BBO dual-chirped optical parametric amplification"
    Optics Express, 28: 15138-47. (2020).
  • 8.Yuxi, F., Midorikawa, K., and Takahashi, E.J.:
    "Dual-Chirped Optical Parametric Application: A Method for Generating Super-Intense Mid-Infrared Few-Cycle Pulses"
    IEEE Journal of Selected Topics in Quantum Electronics 25, 1-13 (2019).
  • 9.Yuxi, F., Midorikawa, K., and Takahashi, E.J.:
    "Towards a petawatt-class few-cycle infrared laser system via dual-chirped optical parametric amplification"
    Scientific Reports, 8: 7692. (2018).
  • 10.Yuxi, F., Bing, X., Midorikawa, K., and Takahashi, E.J.:
    "TW-scale mid-infrared pulses near 3.3μm directly generated by dual-chirped optical parametric amplification"
    Applied Physics Letters, 112: 241105. (2018).

Lab Members

Principal investigator

Eiji J. Takahashi
Chief Scientist

Core members

Natsuki Kanda
Research Scientist
Kotaro Imasaka
Postdoctoral Researcher
Kaito Nishimiya
Postdoctoral Researcher
Rambabu Rajpoot
Postdoctoral Researcher
Dai Ikeda
Postdoctoral Researcher

Contact Information

2-1 Hirosawa, Wako, Saitama 351-0198 Japan
Email: ufsxp-info [at] ml.riken.jp