Optical constants of SUMITA - FK (Fluor crown)
K-FK5
Wavelength:
µm
(0.270 – 2.000)
Derived optical constants
n
k
logX
logY
eV
Dispersion formula
$$n^2=2.189197-0.0097642231λ^{2}+0.0086917382λ^{-2}+0.00023646623λ^{-4}-1.7699987\text{×}10^{-05}λ^{-6}+9.6989631\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false λ_is_vacuum: false temperature: 20.0 °C coefficients_of_thermal_dispersion: -7.46e-06 1.15e-08 -2.45e-10 3.01e-07 2.4e-09 0.169 n_d: 1.48749 V_d: 70.4 glass_code: 487704 density: 2.45 g/cm3 coefficient_of_thermal_expansion_1: 8.8e-06 K-1 coefficient_of_thermal_expansion_2: 9.8e-06 K-1 ΔP_gF: 0.0032 climatic_resistance: 1.0 acid_resistance: 5.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book