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Phys Rev Lett. 2009 Feb 27;102(8):083002. Epub 2009 Feb 26.

Spectral signature of short attosecond pulse trains.

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1
Department of Physics, Lund University, P. O. Box 118, SE-221 00 Lund, Sweden.

Abstract

We report experimental measurements of high-order harmonic spectra generated in Ar using a carrier-envelope-offset (CEO) stabilized 12 fs, 800 nm 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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