Abstract
The refractive indices of KDP for ordinary and extraordinary rays are studied as a function of temperature for mercury lines down to 253.7 nm. A marked hysteresis is observed for the crystal cooled down below T c . The temperature coefficient of the refractive indices in the paraelectric phase has little dependence on the wavelength. From the data obtained the refractive indices and their temperature dependence are discussed from the point of view of the electronic structure.
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