Light Modulator on the Basis of Magneto-Optical Crystal in a Bimorphic Structure Operating in the Magneto-Mechanical Vibration Mode
Keywords:Faraday effect, magneto-optical crystal, bimorphic element
A model of light modulator based on a bimorphic element consisting of a magneto-optical crystal layer on a magnetically passive substrate has been proposed. An equation describing magneto-mechanical vibrations in a rectangular bimorphic element with asymmetric thickness is derived, and an algorithm of its solution in the case of a specimen with free edges is proposed. The modulator is shown to be characterized by a two-dimensional distribution function for the rotation angle of the polarization plane in a light-beam cross-section. Calculations for bismuth-substituted yttrium ferrite garnet on a gadolinium-gallium substrate showed that the rotation angle of the light-beam polarization plane owing to the Faraday effect can reach 3∘ for the fundamental mode of bimorphic element vibrations.
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