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Attosecond Synchronization of High-Order Harmonics from Midinfrared Drivers
Author(s) -
Gilles Doumy,
Jonathan Wheeler,
C. Roedig,
Razvan Chirla,
Pierre Agostini,
Louis F. DiMauro
Publication year - 2009
Publication title -
physical review letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.688
H-Index - 673
eISSN - 1079-7114
pISSN - 0031-9007
DOI - 10.1103/physrevlett.102.093002
Subject(s) - attosecond , physics , harmonics , wavelength , order (exchange) , atomic physics , dispersion (optics) , optics , laser , fourier transform , high harmonic generation , quantum mechanics , ultrashort pulse , voltage , finance , economics
The group delay dispersion, also known as the attochirp, of high-order harmonics generated in gases has been identified as the main intrinsic limitation to the duration of Fourier-synthesized attosecond pulses. Theory implies that the attochirp, which is inversely proportional to the laser wavelength, can be decreased at longer wavelength. Here we report the first measurement of the wavelength dependence of the attochirp using an all-optical, in situ method [N. Dudovich, Nature Phys. 2, 781 (2006)10.1038/nphys434]. We show that a 2 microm driving wavelength reduces the attochirp with respect to 0.8 microm at comparable intensities.

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