Abstract
An accurate method for the precise determination of the refractive index of liquids in the visible and in the infrared is described. The method is based on two laser interferometers where one measures the sample thickness variation in air and the other the change in the optical path length of the liquid sample. In this way, the refractive index of the liquid is directly derived from the two fringe counts without resorting to the measurements of angles or geometrical thicknesses. The experimental results of the refractive index of CCl4 and CS2 in the infrared agree well with the theoretical prediction based on the Kramers–Kronig relation.
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