engleski

Method for the measurement of the refractive index of thick solid and liquid layers

A simple method is proposed for the refractive index measurement of thick solid and liquid layers. In contrast to interferometric methods, no mirrors are used and the experimental setup is undemanding and simple. The method is based on the variation of transmission caused by optical interference within the layer and by the change of the light incidence angle. The new equation for the positions of the interference extrema versus incidence angle is derived. Scattering at the surfaces and within the sample, as well as weak absorption, don’ t play important role. Method is illustrated by the refractive index measurements of sapphire, window glass and water.

optical constants ; refractive index ; optical characterization

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