METHOD OF LASER HETERODYNE TOMOGRAPHY OF REFLECTION GRATINGS
P. E. Tverdokhleb, Yu. A. Shchepetkin
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: отражательная решётка, лазерная гетеродинная томография, коллинеарное гетеродинирование, разрешающая способность метода, reflection grating, laser heterodyne tomography, collinear heterodyning, resolution of the method
Abstract
A method and technical solution for laser heterodyne tomography of the scattering properties of thick light-sensitive materials in the reflection mode are proposed. The method is based on acousto-optical scanning of a test reflection grating recorded in the medium and on the layer-by-layer collinear heterodyne analysis of the scattered field. Formulas for estimating the spatial resolution of the method and the test grating period are derived, and the method sensitivity (dependence of the heterodyne signal on the depth of the grating layers) is estimated. The theoretical conclusions are confirmed experimentally.
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