Designing single-mode fibres for near-IR(1.1¿1.7 ¿m) frequency generation by phase-matched four-photon mixing in the minimum chromatic dispersion region

We describe single-mode fibre design for tailoring the frequency shift at phase matching in stimulated four-photon mixing, and demonstrate near-IR (1.1¿1.7 ¿m) frequency generation in these single-mode silica fibres pumped near the minimum chromatic dispersion region. By controlling the waveguide dispersion´s contribution to phase matching, desired frequency shifts in the 100 to 1800 cm¿1 range are obtained in a series of GeO2-doped silica single-mode fibres pumped with Nd:YAG laser pulses at 1.319 ¿m, when the fibres have an ¿n of ~0.0047 and core diameters varying from 8.4 to 7.2 ¿m.