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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 28, Iss. 1 — Jan. 1, 2011
  • pp: 1–9

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

Shaobo Fang, Takashi Tanigawa, Kenichi L. Ishikawa, Naoki Karasawa, and Mikio Yamashita  »View Author Affiliations


JOSA B, Vol. 28, Issue 1, pp. 1-9 (2011)
http://dx.doi.org/10.1364/JOSAB.28.000001


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Abstract

The detailed theoretical investigation into the spectral phase and intrinsic dispersion of high-order harmonics generated by monocycle pumping [a 1.93 fs ( T 0 ), 580 nm ( λ 0 ), 1.7 2.0 × 10 15 W / cm 2 ( I 0 ), 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 ( I pump = 2 I 0 ) and double- wavelength ( λ pump = 2 λ 0 , T pump = 2 T 0 ) pump. These results were also confirmed by the saddle-point analysis based on the Lewenstein model.

© 2011 Optical Society of America

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(320.0320) Ultrafast optics : Ultrafast optics
(020.2649) Atomic and molecular physics : Strong field laser physics

ToC Category:
Nonlinear Optics

History
Original Manuscript: June 18, 2010
Revised Manuscript: October 22, 2010
Manuscript Accepted: October 24, 2010
Published: December 6, 2010

Citation
Shaobo Fang, Takashi Tanigawa, Kenichi L. Ishikawa, Naoki Karasawa, and Mikio Yamashita, "Isolated attosecond pulse generation by monocycle pumping: the use of a harmonic region with minimum dispersion," J. Opt. Soc. Am. B 28, 1-9 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-1-1


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