Diffraction properties of a reflection photorefractive hologram

Abstract

Diffraction properties of a photorefractive hologram have been described previously in most cases with Kogelnik’s uncoupled-recording-wave-theory, which was originally derived for nonphotorefractive holograms. Despite its simplicity and good approximation, the theory has shown its practical limitations and discrepancies when the refractive-index perturbation is large. We study the diffraction properties of a reflection photorefractive hologram using a coupled-recording-wave approach. A closed-form expression for the diffraction efficiency is obtained. The important aspect of the new formula is that it predicts a lower cross-talk noise (or, a higher wavelength sensitivity) than Kogelnik’s formula. This offers an explanation for the apodization phenomenon (i.e., lower cross-talk noise from the experiment as compared with the analytical result) as found by Rakuljic et al. [Opt. Lett. 17, 1471–1473 (1992)].

© 1994 Optical Society of America

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