Abstract
Interference filters generated in fotorefractive materials have only been investigated very briefly in the literature1. In the present analysis the configuration for the interference filter is shown in Fig. 1. Two coherent laserbeams E1 and E2 are incident on a photorefractive barium titanate (BaTiO3) crystal. Due to the photorefractive effect2 these two incident beams induce a periodic change, with periodicity Λ, in the refractive index of the crystal. A third beam, E3, incident along the x-direction experiences varying layers of high and low index of refraction. The situation experienced by E3 is analogous to that experienced in a multilayer dielectric mirror3 with alternating quaterwave layers of high and low index.
© 1992 Optical Society of America
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