Optical constants of SUMITA - LaFK
K-LaFK50T(M)
Wavelength:
µm
(0.300–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=3.0365333-0.012640924λ^{2}+0.023542665λ^{-2}+0.00054022154λ^{-4}+3.5952261\text{×}10^{-06}λ^{-6}-3.549746\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.67e-06 1.57e-08 -3.04e-10 6.28e-07 3.17e-10 0.192
nd: 1.76209
Vd: 49.6
glass_code: 766498
density: 4.75 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.1e-06 K-1
dPgF: -0.0068
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