Refractive indices of lithium triborate in a temperature range of 20-600 degrees C

Results of measurements of the temperature dependence of the refractive ind ices of lithium triborate in a range of 20-600 degrees C are reported. The thermooptical coefficients dn(o,e)/dt are calculated and their temperature dependences in the given range are presented. The dispersion curves for the function dn(o,e)/dt = f(lambda) for three wavelengths are plotted. Based o n the data obtained, some parameters of the crystal band structure are dete rmined, in particular, the averaged fundamental-oscillator strength S-0 and the averaged fundamental-oscillator position lambda(0).