Abstract

We report the first demonstration of high-harmonic generation from plasma mirrors at a 1kHz repetition rate. Harmonics up to nineteenth order are generated at peak intensities close to 1018W/cm2 by focusing 1mJ, 25fs laser pulses down to 1.7μm FWHM spot size without any prior wavefront correction onto a moving target. We minimize target surface motion with respect to the laser focus using online interferometry to ensure reproducible interaction conditions for every shot and record data at 1kHz with unprecedented statistics. This allows us to unambiguously identify coherent wake emission as the main generation mechanism.

© 2011 Optical Society of America

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