Abstract

It is shown that the influence of atomic autoionizing states on the phase matching of high harmonic generation results in efficient selection of the single harmonic generated in the plateau region. The change of relative concentration of the atomic medium components and variation of the fundamental laser frequency can be used for tuning of the selected harmonic frequency. The possibility of achievement of contrast for the selected single harmonic of more than ${10}^4$ at intensity conversion efficiency of $\sim {10}^{-3}$ has been shown.

© 2009 Optical Society of America

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