Wavelength scaling of efficient high-order harmonic generation by two-color infrared laser fields

We theoretically investigate and demonstrate a better wavelength scaling of harmonic yield in a two-color infrared field. By mixing a Ti:sapphire assistant field with the infrared driving field, we show that high harmonic generation is enhanced and the harmonic yield scales as ${\ensuremath{\lambda}}^{\ensuremath{-}3}$--${\ensuremath{\lambda}}^{\ensuremath{-}4}$ in the plateau region, which falls more slowly as the increase of the driving laser wavelength $\ensuremath{\lambda}$ compared with ${\ensuremath{\lambda}}^{\ensuremath{-}5}$--${\ensuremath{\lambda}}^{\ensuremath{-}6}$ in a one-color infrared field.

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