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Opt Lett. 2007 Oct 15;32(20):2975-7.

Optimizing quasi-phase matching of high harmonic generation using counterpropagating pulse trains.

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  • 1JILA, University of Colorado, and National Institute of Standards and Technologies, Boulder, Colorado 80309, USA.


We formulate a theory of quasi-phase matching of high harmonic generation using weak counterpropagating pulse trains. We predict the optimal laser intensities and pulse shapes for the counterpropagating field and find that the conversion efficiency is better than the efficiency obtained by simply suppressing harmonic emission from out-of-phase regions.

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