Abstract

A closed-form strict correlation between the interference fringe shift and the ray deflection function is derived which enables an accurate determination of the refractive-index distribution in fibers, preform rods, and GRIN-rod lenses to be performed by transverse interferometric methods. The refraction of the probing rays as well as the defocusing effect are entirely compensated and the immersion-object index mismatch is also taken into account. The comprehensive analysis presented proves that nondestructive transverse interferometry can be utilized as a reliable tool in the examination of both GRIN and step-index fibers and rods with low as well as with high numerical apertures.

© 1986 Optical Society of America

Reconstruction of the axisymmetric refractive-index profiles from transverse interferograms in the presence of the immersion–air separating window

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