Optical constants of SUMITA - LaFK
K-LaFK55
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.8185206-0.013230603λ^{2}+0.018037587λ^{-2}+0.00045589602λ^{-4}-2.131672\text{×}10^{-05}λ^{-6}+1.5724724\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.43e-06 1.08e-08 -8.1e-11 5.36e-07 6.73e-10 0.111
nd: 1.69400
Vd: 56.3
glass_code: 694563
density: 4.34 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9.1e-06 K-1
dPgF: -0.0045
climatic_resistance: 1.0
acid_resistance: 4.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book