We report the first demonstration of high-harmonic generation from plasma mirrors at a 1 kHz repetition rate. Harmonics up to nineteenth order are generated at peak intensities close to 1018 W/cm2 by focusing 1 mJ, 25 fs laser pulses down to 1.7 μm 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 1 kHz with unprecedented statistics. This allows us to unambiguously identify coherent wake emission as the main generation mechanism.
© 2011 Optical Society of America
Original Manuscript: March 3, 2011
Manuscript Accepted: March 10, 2011
Published: April 14, 2011
Antonin Borot, Arnaud Malvache, Xiaowei Chen, Denis Douillet, Grégory Iaquianiello, Thierry Lefrou, Patrick Audebert, Jean-Paul Geindre, Gérard Mourou, Fabien Quéré, and Rodrigo Lopez-Martens, "High-harmonic generation from plasma mirrors at kilohertz repetition rate," Opt. Lett. 36, 1461-1463 (2011)