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