Abstract

A Fabry-Perot etalon, employing bismuth-coated CaF2 plates, has been constructed for measuring the dispersion of liquids in the infrared region. The reflectivity of bismuth is sufficiently high to give fringes of high contrast. In order to take advantage of this improved fringe sharpness, a grating spectrometer was used to measure the wavelength of the maxima. Because of a nonideal phase shift, it was necessary to apply an empirically determined correction to the normal integral orders of interference. By using this approach it has been possible to measure the refractive index of CS2 with a relative accuracy of about ±0.001.

© 1961 Optical Society of America

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