Before revision: Surface tension: 0.300 N/m at 1800–2400 °CSurface tension and viscosity measurement of optical glasses using a scanning CO2 laser Index of refraction: nd = 1.4585 (at 587.6 nm) Change of refractive index with temperature: 1.28 × 10−5/K (20–30 °C) Transmission range: Cutoff wavelengths – 160 nm to 5000 nm, with a deep absorption line at 2730 nm.
After revision: Surface tension: 0.300 N/m at 1800–2400 °CSurface tension and viscosity measurement of optical glasses using a scanning CO2 laser Index of refraction: nd = 1.4585 (at 587.6 nm) Change of refractive index with temperature: 1.28 × 10−5/K (20–30 °C) Transmission range: Cutoff – 160 to 5000 nm, with a deep absorption line at 2730 nm.