Intense Attosecond Pulse Research Team
Team Leader
Katsumi MIDORIKAWA (D.Sci.)
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.
- Generation and measurement of attosecond pulses
- Attosecond dynamics in atoms and molecules
- XUV nonlinear optics
- Ultrafast imaging by intense soft x-ray radiation
- November 25, 2008
- Success in emitting a new X-ray with a wavelength in the region of the 'water window', which will enable visualization in situ of living organisms, promising the development of a bench-sized coherent soft X-ray generator suitable for an 'instant shot' measurement of mobile organs
- Takahashi E. J., Lan P., Mücke 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). - Togashi, T., Takahashi E. J., Midorikawa K., Aoyama M., Yamakawa K., Sato T., Iwasaski A., Owada S., Okino T., Yamanouchi K., Kannar F.i, Yagishita A., Nakano H., Couprie M. E., Fukai K., Hatsu T.i, Hara T., Kamehsima T., Kitamura H., Kumagai N., Matsubara S., Nagasono M., Ohashi H., Ohshima T., Otake Y., Shintake T., Tamasaku K., Tanaka H., Tanaka T., Togawa K., Tomizawa H., Takahiro T., Ybashi M., and Ishikawa T.:
"Extreme ultraviolet free electron laser seeded with high-order harmonic of Ti:sapphire laser"
Opt. Exp. 19, 317-324 (2010). - 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). - 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). - Ishikawa, K. L., Takahashi, E. J., and Midorikawa, K.:
"Wavelength dependence of high-order harmonic generation with independently controlled ionization and ponderomotive energy."
Phys. Rev. A 80, 011807(R) (2009). - Takahashi, E.J., Kanai, T., Ishikawa, K. L., Nabakawa, Y., and Midorikawa, K.:
"Coherent water window x-ray by phase-matched high-order harmonics."
Phys. Rev. Lett. 101, 253901 (2008). - Bohman S., Suda A., Kanai T., Yamaguchi S., and Midorikawa K.:
"Generation of 5.0 fs, 5.0 mJ pulse at 1 kHz using hollow fiber pulse compression"
Opt. Lett. 35, 1887-1889 (2010). - Antoine, P., Foumouo, E., Piraux, B., Shimizu, T., Hasegawa, H., Nabekawa, Y., and Midorikawa, K.:
"Two-photon double ionization of helium: An experimental lower bound of the total cross section."
Phys. Rev. A 78, 023415 (2008). - Kanai, T., Takahashi, E.J., Nabekawa, Y., and Midorikawa, K.:
"Observing molecular structure by using high-order harmonic generation in mixed gases."
Phys. Rev. A 77, 041402(R) (2008). - Takahashi, E.J., Kanai, T., Ishikawa, K.L., Nabekawa, Y., and Midorikawa, K.:
"Dramatic enhancement of high-order harmonic generation."
Phys. Rev. Lett. 99, 053904 (2007).