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Isolated attosecond pulse generation by monocycle pumping : the use of a harmonic region with minimum dispersion

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Title: Isolated attosecond pulse generation by monocycle pumping : the use of a harmonic region with minimum dispersion
Authors: Fang, Shaobo Browse this author
Tanigawa, Takashi Browse this author
Ishikawa, Kenichi L. Browse this author
Karasawa, Naoki Browse this author
Yamashita, Mikio Browse this author →KAKEN DB
Issue Date: 1-Jan-2011
Publisher: Optical Society of America
Journal Title: Journal of the Optical Society of America B: Optical Physics
Volume: 28
Issue: 1
Start Page: 1
End Page: 9
Publisher DOI: 10.1364/JOSAB.28.000001
Abstract: The detailed theoretical investigation into the spectral phase and intrinsic dispersion of high-order harmonics generated by monocycle pumping [a 1.93 fs (T0), 580 nm (λ0), 1.7-2.0 x 10^[15] W/cm2 (I0), Gaussian-shaped pulse] showed that it is significantly important for further shortening of isolated attosecond pulses to select the spectral region that has the minimum intrinsic group-delay dispersion and higher-order dispersion in the middle region of the plateau, other than that close to the cutoff where the harmonic intensity drops rapidly. We demonstrated that the selection is carried out directly from the harmonic-order-dependent electron-recombination time, which is obtained from the simple semiclassical method and can be measured by experiment. Consequently, we found that monocycle pumping can generate efficiently 68 as isolated pulses without chirp compensation as well as tunable (115 to 150 eV), sub 70 as pulses from He atoms by tuning the carrier-envelope phase. Particularly, nearly transform-limited 43 as isolated pulses can be produced under the double-intensity (Ipump = 2I0) and double-wavelength (λpump = 2λ0, Tpump = 2T0) pump. These results were also confirmed by the saddle-point analysis based on the Lewenstein model.
Rights: © 2011 Optical Society of America
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山下 幹雄

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