We report visible supercontinuum generation initiated by the second harmonic generation obtained in a germanium-doped microstructured optical fiber after optical poling processing. The visible spectral broadening is due to a cross-phase modulation effect between the generated IR solitons and the second harmonic (532 nm) of the 1064 nm pump wave. The 400-650 nm white-light emission is obtained on the fundamental propagation mode of the fiber.

We experimentally demonstrate strong second-harmonic-generation from a self-induced all-optical poling in germanium-doped fiber with a subnanosecond laser pump at 1064 nm. The large second-harmonic conversion efficiency allows nonlinear spectral broadening at visible wavelengths so that up to nine distinct Raman sidebands have been obtained. In this work we emphasize how the Raman scattering, induced from the pump in the IR region, can drastically affect the optical poling effect, limiting in turn second-harmonic generation.

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One of the objectives of NextGenPCF European Union R&D project is to develop compact and low-cost white-light supercontinuum sources, based on the use of microchip lasers and air/silica microstructured optical fibres. In this paper, we present some experimental results obtained with doped or undoped highly nonlinear fibres. We also introduce and discuss some ways of getting blue/UV frequency generation, which is particularly useful for certain specific biomedical applications. Finally, the different methods proposed for supercontinuum generation are compared, in terms of spectral power density and spectrum range.

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