Method of determining an index of refraction profile of an optic

Details Method of determining an index of refraction profile of an optic Method of determining an index of refraction profile of an optic

1978-09-11

1983-07-05

Corbin, John K.

Optics: measuring and testing

For optical fiber or waveguide inspection

356361, G01N 2145

Patent

active

043915167

ABSTRACT:
A method is disclosed for determining the index of refraction profile of a stepped or graded index type optical fiber having a core encased within a surrounding cladding. An interferogram is formed with a beam of radiant energy passed transversely through the optical fiber. Fringe line shift is measured at a series of points corresponding to a series of mutually parallel ray chord paths extending through the core at mutually diverse minimum radial distances from the core axis. That portion of the measured fringe line shift attributable to discrete differences in indices of refraction of cylindrical core ring portions of thicknesses defined by successive minimum radial distances in the series of ray paths and that of the cladding is sequentially calculated from the outermost core ring portion inwardly towards the core center.

REFERENCES:
patent: 3879128 (1975-04-01), Presby
Marhic et al., "Nondestructive Refractive-Index Profile Measurements of Clad Optical Fibers", Applied Physics Letters, vol. 26.
Saunders et al., "Nondestructive Interterometric Measurements of the Delta and Alpha of Clad Optical Fibers", Applied Optics, vol. 16, No. 9, pp. 2368-2371, 9/77.
Kokubun et al., "Precise Measurement of the Refractive Index Profile of Optical Fibers by a Nondestructive Interference Method", The Transactions of the IECE of Japan, vol. E60, No. 12, pp. 702-707, 12/77.
Hunter et al., "Mach-Zehnder Interferometer Data Relation Method for Retractively Inhomogeneous Test Objects", Applied Optics, vol. 14, No. 3, pp. 634-639, 3/75.

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