Beschreibung:
<jats:p>Acousto-optic interactions involving surface acoustic waves and optical waves in a planar optical waveguide has been a subject of considerable interest in recent years. [See, for examples, C.S. Tsai et al., Proc. IEEE, 64, 318 (1976); C.S. Tsai, 1975 Ultrasonics Symp. Proc.; IEEE Cat. 75 CHO-994-4SU, pp. 120–125.] This interest results from the fact that diffraction efficiency of the resulting thin-film acousto-optic devices can be substantially higher than that of their bulk-wave counterparts and that such devices are more compatible with future wide-band integrated and fiber optic systems. In this paper a selective review of the more recent progress in this subject area is made. First, basic interaction mechanisms, configurations, and key acoustical and optical parameters are discussed. A number of wide-band device configurations which employ isotropic/anisotropic Bragg diffractions and multiple-surface acoustic waves together with the results obtained using optical waveguides in LiNbO3 substrates are then described in detail. Also to be given are the typical performance figures that have been obtained with applications using the resulting wide-band devices, emphasizing those being carried out at the author's institution, including high-resolution light beam deflectors, spectrum analyzers, convolvers, pulse compressors, and tunable optical filters. Finally, the comparative advantages of guided-wave acousto-optic devices over their bulk-wave counterparts will be discussed. [Work supported by NSF, ONR, AFOSR, and BMDATC.]</jats:p>