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Isolated attosecond pulse generation from pre-excited medium with a chirped and chirped-free two-color fieldHongchuan Du, Laoyong Luo, Xiaoshan Wang, and Bitao Hu »View Author Affiliations
Hongchuan Du,
Laoyong Luo,
Xiaoshan Wang,
and Bitao Hu*
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China *Corresponding author: hubt@lzu.edu.cn |
Optics Express, Vol. 20, Issue 9, pp. 9713-9725 (2012)
http://dx.doi.org/10.1364/OE.20.009713
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Abstract
We theoretically investigate the isolated attosecond pulse generation from pre-excited medium with a chirped and chirped-free two-color field. It is found that the large initial population of the excited state can lead to the high density of the free electrons in the medium and the large distortion of the driving laser field after propagation, though it benefits large enhancement of harmonic intensity in single atom response. These effects can weaken the phase-match of the macroscopic supercontinuum. On the contrary, the small initial population of 4% can generate well phase-match intense supercontinuum. We also investigate an isolated attosecond pulse generation by using a filter centered on axis to select the harmonics in the far field. Our results reveal that the radius of the spatial filter should be chosen to be small enough to reduce the duration of the isolated attosecond pulse due to the curvature effect of spatiotemporal profiles of the generated attosecond pulses in the far field.
© 2012 OSA
OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(300.6560) Spectroscopy : Spectroscopy, x-ray
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
ToC Category:
Ultrafast Optics
History
Original Manuscript: February 7, 2012
Revised Manuscript: April 2, 2012
Manuscript Accepted: April 9, 2012
Published: April 13, 2012
Citation
Hongchuan Du, Laoyong Luo, Xiaoshan Wang, and Bitao Hu, "Isolated attosecond pulse generation from pre-excited medium with a chirped and chirped-free two-color field," Opt. Express 20, 9713-9725 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-9-9713
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References
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- C. Altucci, R. Velotta, V. Tosa, P. Villoresi, F. Frassetto, L. Poletto, C. Vozzi, F. Calegari, M. Negro, S. De Silvestri, and S. Stagira, “Interplay between group-delay-dispersion-induced polarization gating and ionization to generate isolated attosecond pulses from multicycle lasers,” Opt. Lett.35, 2798–2880 (2010). [CrossRef] [PubMed]
- F. Calegari, C. Vozzi, M. Negro, G. Sansone, F. Frassetto, L. Poletto, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Efficient continuum generation exceeding 200 eV by intense ultrashort two-color driver,” Opt. Lett.34, 3125–3127 (2009). [CrossRef] [PubMed]
- C. Vozzi, F. Calegari, F. Frassetto, L. Poletto, G. Sansone, P. Villoresi, M. Nisoli, S. De Silvestri, and S. Stagira, “Coherent continuum generation above 100 eV driven by an ir parametric source in a two-color scheme,” Phys. Rev. A79, 033842 (2009). [CrossRef]
- G. Sansone, E. Benedetti, F. Calegari, C. Vozzi, L. Avaldi, R. Flammini, L. Poletto, P. Villoresi, C. Altucci, R. Velotta, S. Stagira, S. De Silvestri, and M. Nisoli, “Isolated single-cycle attosecond pulses,” Science314, 443–446 (2006). [CrossRef] [PubMed]
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- P. Salières, B. Carré, L. Le Déroff, F. Grasbon, G. Paulus, H. Walther, R. Kopold, W. Becker, D. Milosević, A. Sanpera, and M. Lewenstein, “Feynman’s path-integral approach for intense-laser-atom interactions,” Science292, 902–905 (2001). [CrossRef] [PubMed]
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