Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 93, Issue 2-3, Pages 433-442Publisher
SPRINGER
DOI: 10.1007/s00340-008-3187-z
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Funding
- Air Force Office of Scientific research [FA9550-04-1-0242]
- US Department of Energy [DE-AC02-05CH11231]
- Feodor-Lynen Fellowship of the Alexander von Humboldt Foundation
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High-order harmonic emission can be confined to the leading edge of an 800 nm driver laser pulse under moderately intense focusing conditions (7x1014 W/cm2) (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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