Ionization phase-match gating for wavelength-tunable isolated attosecond pulse generation

Abstract : High-order harmonic emission can be confined to the leading edge of an 800 nm driver laser pulse under moderately intense focusing conditions (7×10^14 W/cm^2) (Pfeifer et al. in Opt. Express 15:17120, 2007). Here, the experimentally observed curtailment of harmonic production on the leading edge of the driver pulse is shown to be controlled by an ionization-induced phase-matching condition. The transient plasma density inherent to the process of high-harmonic generation terminates the harmonic emission by an ultrafast loss of phase matching on the leading edge of the laser pulse. The analysis is supported by a reconstruction of the in situ intensity envelope of the driver pulse with attosecond temporal resolution, performed by measurements of the carrier-envelope phase dependence of individual half-cycle harmonic cutoffs. The method opens the way to wavelength-tunable isolated attosecond pulse generation.
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Submitted on : Thursday, October 21, 2010 - 4:23:58 PM
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Aurélie Jullien, Thomas Pfeifer, Mark J. Abel, P.M. Nagel, M.J. Bell, et al.. Ionization phase-match gating for wavelength-tunable isolated attosecond pulse generation. Applied Physics B - Laser and Optics, Springer Verlag, 2008, 93 (2-3), pp.433-442. ⟨10.1007/s00340-008-3187-z⟩. ⟨hal-00528366⟩

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