Laser Technology Laboratory

Novel nonlinear phenomena caused by interaction of ultrashort intense laser pulses with matters are investigated for creation of coherent x-ray sources including x-ray lasers and high-order harmonics. Nonlinear optical phenomena in the soft x-ray region and generation of ultrashort pulses in the region of attosecond seconds are pursued by use of high-order harmonics. In addition, applications of short wavelength and ultrashort laser pulses to material processing and multiphoton microscopy are studied.

Research Subjects

• Ultrashort high intensity lasers and their applications to strong field interaction
• Generation of ultrafast XUV radiation and its application to nonlinear optics in the soft x-ray region
• Generation and measurement of attosecond pulses
• Femtosecond laser processing
• Novel multiphoton microscopy with ultraboradband laser pulses

Publications

1. Lan, P., Takahashi, E. J., and Midorikawa, K.:
   "Efficient control of electron localization of subcycle waveform synthesis"
   Phys. Rev. A 86, 013418 (2012)
2. Isobe, K., Kawano, H., Takeda, T., Suda, A., Kumagai, A., Mizuno, H., MIyawaki, A., and Midorikawa, K.:
   "Background-free deep imaging by spatial overlap modulation nonlinear optical microscopy, "
   Biomed. Opt. Exp. 3, 1594-1608 (2012)
3. Hanada, Y., Sugioka, K., and Midorikawa, K.:
   "Highly sensitive optfluidic chips for biochemical a liquid assay fabricated by 3D femtosecond laser micromachining followed by polymer coating,"
   Lab on a Chip 12, 3688-3693 (2012)
4. Nakatsuji, M.,Tokimasa, A., Harada, T., Nagata, Y., Watanabe,T., Midorikawa, K., and Kinoshita, H.:
   "Development of coherent extreme-ultraviolet scatterometry microscope with high-order harmonic generation source for extreme-ultraviolet mask inspection and metrology, "
   Jpn. J. Appl. Phys, 06FB09 (2012)
5. Togashi, T., Takahashi, E. J., Midorikawa, K., Aoyama, M., Yamakawa, K., Sato, T., Iwasaski, A., Owada, S., Okino, T., Yamanouchi, K., Kannari, F., Yagishita, A., Nakano, H., Couprie, M. E., Fukai, K., Hatsui, T., Hara, T., Kamehsima, T., Kitamura, H., Ku
   "Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser"
   Opt. Exp., 19, 317-324 (2011)
6. Lan, P., Takahashi, E. J., and Midorikawa, K.:
   "Isolated-attosecond-pulse generation with infrared double optical gating"
   Phys. Rev. A, 83, 063839 (2011)
7. Takahashi, E. J., Lan, P., Muecke, O. D., Nabekawa, Y., and Midorikawa, K.:
   "Infrared t-wo-color multicycle laser field synthesis for generating intense attosecond pulse"
   Phys. Rev. Lett., 104, 233901 (2010)
8. Takahashi, E. J., Kanai, T., and Midorikawa, K.:
   "High-order harmonic generation by an ultrafast infrared pulse: Efficient generation of a coherent "water window" x-ray"
   Appl. Phys. B, 100, 29-41 (2010)
9. Furukawa, Y., Nabekawa, Y., Okino, T., Saugout, S., Yamanouchi, K., and Midorikawa, K.:
   "Nonlinear Fourier-transform spectroscopy of D2 using high-order harmonic radiation"
   Phys. Rev. A, 82, 013421 (2010)
10. Nabekawa, Y., Shimizu, T., Furukawa, Y., Takahashi, E. J., and Midorikawa, K.:
    "Interferometry of attosecond pulse train in the extreme ultraviolet wavelength region"
    Phys. Rev. Lett., 102, 213904 (2009)