Using the so-called ac field technique, we investigate experimentally the influence of optical beam coupling on the generation of subharmonic gratings in a photorefractive sillenite crystal. By the use of two different recording configurations, we are able to distinguish between effects caused by material nonlinearities and effects caused by optical beam coupling.
© 1998 Optical Society of America
Henrik C. Pedersen, Per M. Johansen, and D. J. Webb, "Photorefractive subharmonics—a beam-coupling effect?," J. Opt. Soc. Am. B 15, 1528-1532 (1998)