Acousto-optical 2 X 2 switches of optical beams with different wavelengths for fibre-optic gyroscopes

摘要

New types of acousto-optical 2 X 2 switches of optical beams with different wavelengths, intended for fibre-optic gyroscopes, and analysed and proposed. These switches make it possible to transmit two different radiations through the dame fibre coil and thus obtain two independent Sagnac signals related to coil rotation. A method for calculating the angular and frequency characteristics of he switches is described. Experiments on volume acousto-optical diffraction in a TeO_2 single Crystal confirm, on the whole, the theoretical conclusions.