Techniques to directly write localised refractive index structures in polymer optical fibres (POF) are presented, using UV
(400nm) ultrafast laser with pulse lengths of 100 fs to create in-fibre gratings for sensing. No doping is necessary for
photosensitisation so commercially available POF is used. An in-fibre grating consisting of a 1.8 μm wide refractive
index structure with a periodicity of 189 nm was demonstrated in single mode polymer fibre with optimised laser
processing parameters.
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