Optical constants of SUMITA - GFK
K-GFK68(M)
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.4921178-0.0059252429λ^{2}+0.012541311λ^{-2}+0.00020379328λ^{-4}-3.7798198\text{×}10^{-06}λ^{-6}+2.5829936\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false wavelength_is_vacuum: false temperature: 20.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -2.36e-05 2.85e-09 4.82e-11 4.01e-07 2.74e-10 0.183 nd: 1.58998 Vd: 68.3 glass_code: 592683 density: 4.51 g/cm3 thermal_expansion: - temperature_range: -30 70 °C coefficient: 1.29e-05 K-1 - temperature_range: 20 300 °C coefficient: 1.52e-05 K-1 dPgF: 0.0179 climatic_resistance: 1.0 acid_resistance: 1.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book