Measurement of the refractive-index profile of planar waveguides by the use of a double Lloyd's interferometer
- 1 November 1996
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 35 (31) , 6173-6178
- https://doi.org/10.1364/ao.35.006173
Abstract
We present a nondestructive experimental method to measure monotonically varying refractive-index profiles of planar waveguides. The technique is a modification of the Lloyd's mirage setup proposed by Allman et al. [Appl. Opt. 33, 1806 (1994)] in order to have a reference phase distribution for the interference pattern. The theoretical calculations have been implemented to account for multiple reflections inside the sample. An application of the method to ion-exchanged glass waveguides is reported.Keywords
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