Abstract
Harmonics up to the 18th order are generated from solid targets by focusing , pulses at to a spot size of (FWHM). To our knowledge, this is the first demonstration of high-harmonic generation with a very short focal length paraboloid () and kilohertz laser system. The harmonics have a low divergence () compared to the driving beam and conversion efficiencies ( per harmonic) comparable to gas harmonics. No contrast enhancement techniques are employed, and the system is capable of operating at .
© 2010 Optical Society of America
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