Abstract
Optical properties of sodium alminosilicate (NAS) glasses are investigated theoretically and experimentally. Rayleigh ratio and infrared absorption loss are measured for various compositions of NAS glasses prepared by melting. These measurements show that Rayleigh scattering loss of SiO 2 glass is greatly reduced when Na 2O and Al 2O 3 are added to it, which results in reduction of the glass fixation temperature and the photoelastic constant. The multiphonon edge absorption in the 2.5–6 μm region is also measured and the infrared edge wavelength is found to be the same as that of pure silica. The total loss of a NAS glass is found to be 0.055 dB/km at a wavelength of 1.56 μm. This value is about one-third that of pure silica core fiber and it indicates the potential of NAS glasses as a low loss fiber material.
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