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Generation of femtosecond radiation at 211 nm by femtosecond pulse upconversion in the field of a picosecond pulse

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Abstract

We show that, in the case of sum-frequency mixing, one can alleviate group-velocity mismatch between IR and UV pulses by choosing different pulse widths, thus extending the interaction length of ultrashort pulses within nonlinear crystals. By fifth-harmonic generation with a Nd:glass laser, we demonstrate efficient frequency upconversion of 195-fs 264-nm pulses under the envelope of 0.9-ps 1055-nm pulses in β-barium borate crystal, yielding <270fs pulses with energy of up to 110 µJ at 211 nm.

© 2000 Optical Society of America

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