Title :
Viscosity of GeO2-doped silica glasses
Author :
Tajima, Katsusuke ; Tateda, Mitsuhiro ; Ohashi, Masaharu
Author_Institution :
R&D Center, NTT Telecommun. Field Syst., Ibaraki, Japan
fDate :
3/1/1994 12:00:00 AM
Abstract :
The viscosity of GeO2-doped silica glasses is experimentally evaluated and found to be expressed as a function of the monoexponential form η0 exp(-AΔe), where η0 is the viscosity of pure silica glass, A is a positive constant, and Δe is an equivalent relative-index difference that is introduced for a silica glass with nonuniform dopant distribution in its cross section. The constant A for GeO2-doped silica glasses is found to be about 0.5, which is much smaller than that for fluorine-doped silica glasses and has almost no temperature dependence between 1400°C and 2200°C
Keywords :
germanate glasses; optical fibres; optical glass; viscosity; 1400 to 2200 degC; GeO2-doped silica glasses; SiO2-GeO2; equivalent relative-index difference; monoexponential form; nonuniform dopant distribution; positive constant; temperature dependence; viscosity; Difference equations; Furnaces; Glass; Laser beams; Least squares methods; Q measurement; Refractive index; Silicon compounds; Temperature distribution; Viscosity;
Journal_Title :
Lightwave Technology, Journal of
