Abstract

We establish the optimal methodology for the extraction of depth-resolved vibrational information from a transparent, optically homogeneous sample by use of variable-angle internal-reflection Raman spectroscopy. Our apparatus and beam-handling methods eliminate the common systematic errors associated with control of evanescent fields, such as complications involving Gaussian beams and coherent backreflections within the internal-reflection element. We demonstrate the technique by experiments on a semi-infinite material. We can determine the uniform system optical parameters with a precision of five significant figures and an accuracy of $\pm 0.05\%.$

© 1997 Optical Society of America

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