Abstract

A photonic-crystal fiber (PCF) is used to demonstrate a fiber-optic format of efficient third-harmonic generation through a 3ω=2ω+2ωω parametric four-wave mixing, involving 1.24μm radiation of a femtosecond Cr:forsterite laser (ω) and its second-harmonic output (2ω). The frequency of the 3ω fiber output is tuned within the range of wavelengths from 407to433nm by changing the peak power of the 1.24μm input laser pulses through cross-phase-modulation-induced instability. The 3ω field is shown to play a significant role in supercontinuum generation in a PCF, substantially enhancing the short-wavelength part of the supercontinuum spectrum.

© 2007 Optical Society of America

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