Abstract
Rayleigh scattering, refractive index and viscosity were investigated for fluorine-doped soda magnesium silicate (NMS) glasses to evaluate their potential for use as a cladding material for NMS glass which is known to exhibit low Rayleigh scattering intensity. By substituting 5 mol% of MgF2 for MgO, the scattering intensity was increased and the refractive index decreased. The scattering increase was considered to be due to concentration fluctuation induced by F-doping. Some samples, however, exhibited lower scattering intensity than silica glass. Moreover, it was possible to match the viscosities of the core and cladding glasses by adjusting the F and SiO2 contents. These results imply that these F-doped glasses are suitable as cladding material for NMS glass fibers.
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