Polarization effects and their minimization in an infrared single-mode fibre-optic double-Fourier stellar interferometer.

Physics – Optics

Scientific paper

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Interferometry: Polarization

Scientific paper

In astronomical double-Fourier interferometry, stretching a single-mode fibre to generate optical path length modulation is an attractive alternative solution to the more classical bulk delay line. However, such an operation is not free from side effects, one of them being the perturbation of the radiation state of polarization by the waveguide. The authors present both theoretical and experimental investigations of the polarization behaviour of single-mode fibres in a double-Fourier interferometer. Polarization effects can be minimized by introducing a polarization controller or better yet, as is proposed here, the fibre can be wrapped in a specific way to neutralize the perturbations.

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