Optical constants of SUMITA - LaFK
K-LaFK50(M)
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=3.0568421-0.011998981λ^{2}+0.024194996λ^{-2}+0.0004815051λ^{-4}+2.2084112\text{×}10^{-06}λ^{-6}+4.3040075\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -3.11e-07 1.35e-08 -2.34e-10 5.76e-07 8.89e-10 0.201
nd: 1.76831
Vd: 49.7
glass_code: 772500
density: 5.2 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9e-06 K-1
dPgF: -0.0056
climatic_resistance: 1.0
acid_resistance: 3.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book