Spectral signature of short attosecond pulse trains
E. Mansten, J. M. Dahlstrom, J. Mauritsson, T. Ruchon, A. LHuillier,, J. Tate, M. B. Gaarde, P. Eckle, A. Guandalini, M. Holler, F. Schapper, L., Gallmann, and U. Keller
TL;DR
This paper investigates the spectral signatures of short attosecond pulse trains generated in argon, revealing interference effects between pulses and how these are influenced by the carrier-envelope phase, supported by experiments and modeling.
Contribution
It introduces an analytical model and numerical simulations to explain spectral interference features in high-order harmonic spectra from short pulse trains.
Findings
Spectral peaks between harmonics are due to pulse interferences.
Peak positions depend on the carrier-envelope offset.
Number of peaks correlates with the number of pulses in the train.
Abstract
We report experimental measurements of high-order harmonic spectra generated in Ar using a carrier-envelope-offset (CEO) stabilized 12 fs, 800nm laser field and a fraction (less than 10%) of its second harmonic. Additional spectral peaks are observed between the harmonic peaks, which are due to interferences between multiple pulses in the train. The position of these peaks varies with the CEO and their number is directly related to the number of pulses in the train. An analytical model, as well as numerical simulations, support our interpretation.
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