Abstract
We experimentally investigate the high-order harmonic generation in argon gas using a driving laser pulse at a center wavelength of $1240\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. High-contrast fine interference fringes could be observed in the harmonic spectra near the propagation axis, which is attributed to the interference between long and short quantum paths. We also systematically examine the variation of the interference fringe pattern with increasing energy of the driving pulse and with different phase-matching conditions.
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