General solution of the coupled-wave equations of acousto-optics.
The basic problem of the diffraction of an optical plane wave by an acoustic plane wave in an anisotropic homogeneous medium is considered. The acousto-optical interaction is considered indifferently of the isotropic or of the birefringent type. Coupled-wave equations are obtained rigorously and cast into an eigenvalue value problem. A general solution is obtained for the diffraction efficiency of diffracted orders, for any interaction length and diffraction regime. The theory includes the Bragg regime, the Raman-Nath regime, and all intermediate situations in the same formulation. The method of solution is both exact and computationally efficient. It is similar in character to the rigorous coupled-wave analysis of Moharam and Gaylord but differs by the choice of basis functions adapted to propagating rather than static gratings. Examples are given for acousto-optical interaction in paratellurite, TeO2.
Laude
Vincent
V
Laboratoire de Physique et Métrologie des Oscillateurs, Centre National de la Recherche Scientifique, Unité Propre de Recherche 3203, Associé a l'Université de Franche-Comté, 32 avenue de l'Observatoire, F-25044 Besançon, France. vincent.laude@lpmo.edu