Anisotropic intrasignal coupling in photorefractive linbo₃

Abstract

lntrasignaling coupling in a LiNb03 photorefractive crystal is studied. It is shown that the anisotropy nature of the effective electrooptic coefficient of this crystal results in an orientation-dependent intrasignal coupling. Analytical solutions for one-dimensional intrasigrial coupling are derived for a-axis and b-axis orientations, which enables us to estimate the maximum beam field angle and the maximum crystal thickness for a given intensity distortion due to the coupling. The results are thus illustrative to applications of this crystal in areas such as holographic data storage, interconnection, spatial mode conversion, et cetera.ABSTRACT Equivalent surface electric and magnetic sources can generate an approxbnnte far field scattered off a conductor. These are exact (elec-tric) and approximate (magnetic) images of the exciting equivalent sources. A physical-optics-type computation with improved accuracy, which also accommodates concave surfaces, is achieved. 0 1994 John Wiley & Sons, Inc.