Abstract

We report guiding of sub-100-fs pulses at intensities up to 5×1015 W/cm2 over a distance of 1  cm in a preformed plasma channel. The width of the guided pulse was shortened, which we attribute to ionization-induced refraction at the channel entrance. A pulse energy throughput of 30% in the lowest-order was measured.

© 1997 Optical Society of America

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