High-order harmonic generation from solid targets with 2 mJ pulses |
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| Authors: | Easter James H Mordovanakis Aghapi G Hou Bixue Thomas Alexander G R Nees John A Mourou Gérard Krushelnick Karl |
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| Institution: | Center for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel Boulevard, Ann Arbor, Michigan 48109, USA. jheaster@umich.edu |
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| Abstract: | Harmonics up to the 18th order are generated from solid targets by focusing 2 mJ, 50 fs pulses at 800 nm to a spot size of 1.7 μm (FWHM). To our knowledge, this is the first demonstration of high-harmonic generation with a very short focal length paraboloid (f/1.4) and kilohertz laser system. The harmonics have a low divergence (<4°) compared to the driving beam and conversion efficiencies (>10(-7) per harmonic) comparable to gas harmonics. No contrast enhancement techniques are employed, and the system is capable of operating at 500 Hz. |
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