Abstract

We report the first experimental demonstration (to our knowledge) of high-order harmonic generation in rare gases driven by a state-of-the-art high-power Yb-doped-fiber chirped-pulse amplification system. The fiber laser delivers 270fs pulses in the 30100μJ energy range at repetition rates varying from 100kHz to 1MHz. A proper focalization allows reaching several 1013Wcm2 in a gas jet. We have been able to produce and detect harmonics up to order 31 (33.2nm) in Ar at a 100kHz repetition rate. High-order harmonic generation at 1MHz is also demonstrated in Xe up to harmonic 15. The demonstrated extreme UV (XUV) source will bring ultrashort XUV coincidence experiments from synchrotron facilities to tabletop laboratories.

© 2009 Optical Society of America

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