Abstract

A multiline laser beam incident upon a BaSrKNaNb₅O₁₅ crystal causes rings to form in the beam fan by means of cooperative photorefractive fanning between the different wavelengths. We examine the novel case in which the input beam consists of two lines from an argon-ion laser with independently controlled linear polarizations as well as the single-line case with equal amounts of ordinary and extraordinary light. We compute the expected rings in each case, taking full account of the crystal birefringence, and compare them with the experimental data. Applications of the rings to crystallography and cryptology are presented.

© 1994 Optical Society of America

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