International audienceWe investigate an acousto-optic tunable filter setup for wavelength division multiplexing telecommunication applications in wideband C (100 nm around 1550 nm). Anisotropic Bragg diffraction of light in TeO2 bulk crystal is first investigated experimentally and theoretically in a quasi-collinear interaction configuration. Based on those characterizations, we propose a double-pass optical beam which allows us to improve the filter performances in terms of crosstalk and selectivity: the full width at half maximum and the sidelobe level are reduced

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In this paper, we present an original acousto-optic device which allows to separate an arbitrary polarised incident light beam into two orthogonally polarised diffracted beams. This device operates with a single frequency ultrasonic wave and the two diffracted orders are frequency up and down shifted, respectively. A birefringent crystal of Paratellurite has been chosen for experimental validation due to its very high acousto-optic figure of merit for the slow acoustic shear wave. This device has been conceived in order to be implemented in a optical modulation line of a stereoscopic laser videoprojector based on the simultaneous projection of the two left and right images orthogonally polarised. Special polarising glasses select the two images for each eye. The projection is based on a X-Y scanning of a laser beam which is both intensity and polarisation modulated. The "on-line" separator allows to dynamically control and minimize the "ghost" phenomenon of a such a stereoscopic system.