Bragg diffraction of light by ultrasonic shear waves in a plane-parallel layer |
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Authors: | A E Anisimova G V Kulak T V Nikolaenko |
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Institution: | 1.I. P. Shamyakin Mozyr State Pedagogical University,Mozyr,Belarus |
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Abstract: | We have studied anisotropic Bragg diffraction of light by ultrasonic shear waves in an optically isotropic plane-parallel
layer. We have established the analytical dependences of the relative intensities and polarization azimuths of reflected and
transmitted diffracted waves on the intensity of the ultrasound, the layer thickness, the angle of incidence, and the polarization
azimuth of the incident light. We show that rotation of the plane of polarization of the diffracted wave is determined by
the different Fresnel reflection of the s and p polarized components of the incident light in the plane-parallel layer. We
have determined that in mismatched acousto-optic structures, deep amplitude modulation of transmitted and reflected light
is possible which is an order of magnitude greater than the usual modulation in matched structures. |
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