Attosecond Science Research Team

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.

Research Fields

Physics / Engineering / Chemistry / Materials Sciences / Biology & Biochemistry

Research Subjects

• Generation and measurement of attosecond pulses
• Attosecond dynamics in atoms and molecules
• XUV nonlinear optics
• Ultrafast imaging by intense soft x-ray radiation

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).