The guided acoustooptical interaction on the (100) plane of GaAs is investigated as a function of waveguide thickness type of mode, acoustic frequency, direction of acoustic wave propagation, and substrate refractive index Our calculated results indicate that best efficiency is obtained for TE(0) ? TE(0) optical modes and for acoustic surface wave propagating along the ?01l? direction at a waveguide thickness close to cut-off Under these conditions, approximately 75 mW of acoustic power is required for 100% diffraction. For a transducer aperture giving 50 Omega of radiation resistance, the rf bandwidth of the diffraction is limited essentially by the frequency bandwidth of the interdigital transducer. A comparison of the calculated results with experimental data at 1.06-microm optical wavelength is also given.
Convolution of two acoustic surface waves (ASW) has been obtained by the acousto-optical diffraction of an optical wave in an As2S3 waveguide. A simple theory is presented to show the convolution process. Experimentally, very high acousto-optical diffraction efficiency (93% at 3 mW of acoustic power) has been observed in the As2S3 waveguide. A triangular pulse was observed on the oscilloscope through an optical heterodyne detector when two rectangular ASW pulses were convolved with each other.
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