Abstract

A successful verification of a method for numerical reconstruction of axially symmetric refractive index distribution is reported. Directions of rays emerging from a test object are used as input data for reconstruction. They are obtained by numerically calculating the spatial frequency of the fringes in an interferogram. It is also shown that the same data can be obtained directly by counting moiré fringes arising from two slightly displaced interferograms. An acrylic resin immersed in liquid is used as a test object. The reconstruction is carried out with errors of a few percent.

© 1977 Optical Society of America

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