Abstract

Leading term approximative analytical formulas are derived for the powers of the fringes formed by a periodically distorted homogeneous nematic layer, illuminated by a monochromatic light beam at normal incidence. The agreement between the predictions of the derived formulas and those of the direct numerical computation for the odd-order fringes is restricted to very small distortions and, thus, to very low fringe power values. On the other hand, the respective comparison for the even-order fringes gives quite satisfactory results provided the sample is sufficiently thick and the order of the fringe is low.

© 1989 Optical Society of America

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