We demonstrate that recording thick holographic phase gratings in photorefractive polymers can lead not only to very efficient Bragg diffraction but also to rather strong diffraction into non-Bragg orders. We show that this effect has features drastically different from those of Raman-Nath diffraction on thin gratings. We compare the experimental results with a model based on the theory of dynamic self-diffraction in a photorefractive medium. Applications of this effect in devices for optical image processing are proposed.
© 1996 Optical Society of America
B. L. Volodin, B. Kippelen, K. Meerholz, N. V. Kukhtarev, H. J. Caulfield, and N. Peyghambarian, "Non-Bragg orders in dynamic self-diffraction on thick phase gratings in a photorefractive polymer," Opt. Lett. 21, 519-521 (1996)