Journal
OPTICS LETTERS
Volume 33, Issue 2, Pages 174-176Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.33.000174
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We extend all-optical quasi-phase matching of high-order harmonic generation into spectral regions where conventional phase matching is not possible. The high laser intensities required to generate harmonics at energy > 130 eV, coupled with the resulting high level of ionization, preclude conventional phase matching in all nonlinear media. Selective enhancement factors between 40 and 150 in the flux of harmonics at photon energies around 140 eV are demonstrated using a train of two counterpropagating pulses. (c) 2008 Optical Society of America.
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