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Proceedings Paper

Comparison of methods for determining linear birefringence
Author(s): Peter Lampen; Ernst Heiner Korte; A. Blumenberg
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Paper Abstract

For the determination of the ordinary and extraordinary refractive indices of nematic liquid crystals in the infrared spectral region, a refractometer was developed. It is a critical angle refractometer of the Abbe type, basically usable in the range from n equals 1.3 to 1.8 and from 4000 cm-1 to 700 cm-1. The reliability of the measurements is 1 X 10-3 and the spectral resolution is 1.5%. The values of the refractive index derived from the critical angle are used as anchor points for Kramers-Kronig transformation (KKT) of a transmittance spectrum of the compound.

Paper Details

Date Published: 1 March 1992
PDF: 2 pages
Proc. SPIE 1575, 8th Intl Conf on Fourier Transform Spectroscopy, (1 March 1992); doi: 10.1117/12.56351
Show Author Affiliations
Peter Lampen, Institut fuer Spektrochemie und Angewandte Spektroskopie (Germany)
Ernst Heiner Korte, Institut fuer Spektrochemie und Angewandte Spektroskopie (Germany)
A. Blumenberg, Institut fuer Spektrochemie und Angewandte Spektroskopie (Germany)


Published in SPIE Proceedings Vol. 1575:
8th Intl Conf on Fourier Transform Spectroscopy

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