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Applied Optics

Applied Optics


  • Vol. 34, Iss. 25 — Sep. 1, 1995
  • pp: 5708–5714

Measurement of the complex refractive index of liquids in the infrared using spectroscopic attenuated total reflection ellipsometry: correction for depolarization by scattering

J. H. W. G. den Boer, G. M. W. Kroesen, and F. J. de Hoog  »View Author Affiliations

Applied Optics, Vol. 34, Issue 25, pp. 5708-5714 (1995)

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With spectroscopic ellipsometry one can measure the real and imaginary parts of the refractive index of a medium simultaneously. To determine this index in the infrared for a number of technical liquids, use was made of attenuated total internal reflection at the glass–liquid interface of a specially designed prism. This attenuated total reflection approach warrants minimal signal loss and is, for strongly absorbing liquids, the only way to measure the complex refractive index. A surprising phenomenon, observed when BK-7 prism glass was used, is scattering in the vicinity of the absorption wavelengths of the glass. A simple model that can be used to describe the relations among absorption, scattering, and depolarization was successfully used to correct the measurements. Refractive indices for demineralized water, Freon 113, heptane, benzene, gas oil, and crude oil in the wave number range from 5000 to 10,000 cm−1 (1–2 μm) are presented.

© 1995 Optical Society of America

Original Manuscript: July 25, 1994
Revised Manuscript: March 14, 1995
Published: September 1, 1995

J. H. W. G. den Boer, G. M. W. Kroesen, and F. J. de Hoog, "Measurement of the complex refractive index of liquids in the infrared using spectroscopic attenuated total reflection ellipsometry: correction for depolarization by scattering," Appl. Opt. 34, 5708-5714 (1995)

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