Fibre Bragg gratings (FBGs) transform a conventional multi-mode optical fibres into side-emmitting light sources with controllable emission angles, which find applications in endoscopy, (bio-)photoreactors and spectroscopy.
The FBGs were inscribed in of soft-glass indium fluoride-based optical fibres with a two-beam phase-mask interferometer and a 266-nm femtosecond laser. The scattering pattern was imaged in Fourier space accessed by inserting a Bertrand lens in the beam path. Fibre rotation during the imaging yields a 360-deg all-around view.
The FBGs far-field scattering pattern demonstrated discrete broken bands, or scattering cones with different opening angles, for the different laser colours. Furthermore, multiple cones could be observed for the case of complicated, higher harmonics grating refractive index profiles, which provides additional tool to design tailored fibre light emitters or guided light analyser gratings.
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