Abstract

In the standard M-line method for the characterization of graded-index films, an analytical curve is fitted to the waveguide mode measurements and extrapolated to provide the refractive index in the zero-depth limit. Here we review our polarimetric approach to a direct near-surface measurement, which complements the M-line method. Also, we present its new and more straightforward version, which is applicable to existing samples and does not require masking before ion exchange.

© 2003 Optical Society of America

Effect of Refractive Index Gradients on Index Measurement by the Abeles Method

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Opt. Lett. 28(13) 1132-1134 (2003)