Bragg coupling efficiency for guided acoustooptic interaction in GaAs

Abstract

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.

Effect of surface acoustic waves on low-temperature photoluminescence of GaAs

“…The acoustic power was measured by the optical method, and its maximal value was equal to P max ϭ1.1 mW. Using data on the SAW structure 17 we found the components of the deformation tensor and piezoelectric field for the maximal acoustic power: T 11 ϭ3•10 Ϫ5 , T 33 ϭ9•10 Ϫ6 , and E 1 ϭ1.7•10 4 V/cm, E 3 ϭ1.7•10 3 V/cm ͑an index of 1 corresponds to the SAW propagation direction ͓110͔, an index of 3 corresponds to the normal to the surface͒.…”

Surface-acoustic-wave-driven acoustooptic modulator with wide wavelength range for visible laser light

“…Figure 6 shows the optical wavelength dependence of the measured driving SAW power (P 100 ) required to obtain the maximum diffraction efficiency. The theoretical results obtained from coupled-mode theory [3], in which a planar waveguide was assumed, are also shown in this figure. The values of the experimentally obtained P 100 were an order of magnitude larger than the theoretical values.…”

Acousto-Optic Modulator Driven by Surface Acoustic Waves

“…1. The measured results were tted using the sin 2 -curve solution of coupled-mode equations [13]. The SAW power required for maximum diraction P 100 was determined from the peak power of the tted curve.…”

“…The theoretical P 100 for TM 0 mode was calculated by using the coupled mode theory [13]. P 100 is obtained by the relationship…”