Abstract

A photonic-crystal fiber (PCF) is used to demonstrate a fiber-optic format of efficient third-harmonic generation through a $3\omega =2\omega +2\omega -\omega$ parametric four-wave mixing, involving $1.24\mu \mathrm{m}$ radiation of a femtosecond Cr:forsterite laser $\left(\omega \right)$ and its second-harmonic output $\left(2\omega \right)$. The frequency of the $3\omega$ fiber output is tuned within the range of wavelengths from $407\text{to}433\mathrm{nm}$ by changing the peak power of the $1.24\mu \mathrm{m}$ input laser pulses through cross-phase-modulation-induced instability. The $3\omega$ 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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