Abstract
Densities, refractive indices, and IR (reflection and absorption) spectra are systematically investigated for permanently densified silica glasses. The linear relation between refractive index and density of the densified silica glasses is observed in a wide range of densities. The frequency of the IR band near 1100 cm −1 is found to decrease linearly with increasing density. The Grüneisen constants are evaluated with IR spectra. The optical properties of densified silica glasses are discussed with the proposed relations linking density, refractive index, Grüneisen constant, and mean polarizability. The difference in refractive index of permanently densified and in situ compacted glasses with the same density is due to different Grüneisen constants.
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