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