Abstract

We investigate the spatial evolution of a laser pulse used to generate high-order harmonics (orders ranging from 45 to 91) in a semi-infinite helium-filled gas cell. The 5mJ, 30fs laser pulses experience elongated focusing with two distinct waists when focused with f125 optics in 80  Torr of helium. Extended phase matching for the generation of harmonics occurs in the region between the double foci of the laser, where the laser beam changes from diverging to converging.

© 2006 Optical Society of America

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