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 5 mJ, 30 fs laser pulses experience elongated focusing with two distinct waists when focused with f/125 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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History
Original Manuscript: August 9, 2006
Manuscript Accepted: September 15, 2006
Revised Manuscript: September 8, 2006
Published: November 9, 2006

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Author Affiliations

John C. Painter, Mark Adams, Nicole Brimhall, Eric Christensen, Gavin Giraud, Nathan Powers, Matthew Turner, Michael Ware, Justin Peatross

Brigham Young University

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