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Enhanced four-wave mixing in a hollow-core photonic-crystal fiber

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Abstract

Hollow-core photonic-crystal fibers are shown to substantially enhance four-wave mixing (FWM) of laser pulses in a gas filling the fiber core. Picosecond pulses of Nd:YAG fundamental radiation and its second harmonic are used to generate a signal at the frequency of the third harmonic by the FWM process 3ω=2ω+2ω-ω. The efficiency achieved for this process in a 9-cm-long, 13µm-hollow-core-diameter photonic-crystal fiber, designed to simultaneously transmit a two-color pump and the FWM signal, is shown to be 800 times higher than the maximum FWM efficiency attainable with the same laser pulses in the tight-focusing regime.

© 2003 Optical Society of America

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