Optical constants of SUMITA - GFK
K-GFK70(M)
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.4208616-0.0057307899λ^{2}+0.011396384λ^{-2}+0.00014964607λ^{-4}+3.8084377\text{×}10^{-06}λ^{-6}-3.2734834\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.47e-05 -1.68e-09 -2.49e-11 3.77e-07 3.45e-10 0.178
nd: 1.56627
Vd: 71.3
glass_code: 569713
density: 4.46 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 1.32e-05 K-1
- temperature_range: 20 300 °C
coefficient: 1.56e-05 K-1
dPgF: 0.0207
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