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_absolute: false
λ_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -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
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 8.8e-06 K-1
- temperature_range: 20 300 °C
coefficient: 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