The refractive indices of the potassium titanyl phosphate (KTP) crystal have been measured in
the temperature interval 20- 550 °C. It is shown that their values increase as temperature
increases, and this is because the lattice contribution predominates. The curves showing the
temperature dependence of the refractive indices for various wavelengths are not parallel
to each other, and, as a consequence, the thermooptical coefficients Dn/Dt for a violet wavelength
are almost a factor of two greater than for red. Dispersion curves are presented for the
refractive indices and thermooptical coefficients.
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