Abstract

We theoretically investigate the wavelength scaling of high-order harmonic yield from a Rydberg atom driven by a few-cycle pulse. It is found that the harmonic yield decreases with a slow scaling ${\lambda }^{-2.8}$ as the increase of the laser wavelength for a Rydberg atom compared with ${\lambda }^{-4.6}$ for a ground atom though the traveling time of the electron in the continuum state is longer for a Rydberg atom. Further analysis reveals that the initial large spatial width of the Rydberg atom is responsible for the slow wavelength scaling of the high-order harmonic yield.

© 2014 Optical Society of America

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