THE MEAN POLARIZABILITY AND DENSITY OF GLASSES (VOL 229, PG 217, 1997)

With the combination of the dispersion theory and the Gruneisen consta nt, the frequency- and density-dependence of the mean polarizability o f transparent glasses is discussed. The mean polarizability a is found to be a function of the density rho of the glass and the angular freq uency omega of the incident light. This function is described by a dif ferential equation of partial derivative alpha/partial derivative rho = - [gamma]/rho(2 alpha + omega partial derivative alpha/partial deriv ative omega), where [gamma] is the mean Gruneisen constant. At a given frequency of the incident light, the mean polarizability is linearly proportional to the density of the glass. in combination with the Newt on-Drude and Lorentz-Lorenz equations, the proposed relationships are used to study the refractive indices of densified SiO2-glasses.