Refractive Indices and Some Other Optical Properties of Synthetic Emerald: Temperature Dependence

Abstract : The temperature dependence of the refractive indices for ordinary and extraordinary rays of mercury spectrum three lines and laser line independently one from the other were measured in temperature interval 2O-600 deg C. It was obtained that the refractive indices increase along with the temperature growth and this dependence has quasilinear character. Emerald has quite low birefringence values that increases slightly along with the temperature growth and decreases with wavelength growth. The thermooptical coefficients for every wavelength were calculated. They have greater values for the extraordinary beams than for the ordinary ones. The dispersion curve for refractive indices was obtained.