Abstract
Two new nondestructive methods for measuring refractive index are presented. The methods are promising for investigating new materials because they do not require contact with the sample surfaces or étalon samples. Results of measurements of optical properties for photopolymer rheoxane are presented. In the IR spectral band the dispersion is almost zero and the transmission is almost constant. The refractive index varies over the spectral range of 1.15-3.39 µm by a few parts in the third decimal place. The dependence of the refractive index on temperature from 10 to 50 °C is comparable with the analogous dependence for optical glasses.
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