Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK6
Wavelength:
µm
(0.300–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.6532657-0.011570116λ^{2}+0.015955637λ^{-2}+0.00023811283λ^{-4}+1.7165459\text{×}10^{-05}λ^{-6}-1.4129709\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false wavelength_vacuum: false temperature: 20.0 ℃ thermal_dispersion: - type: "Schott formula" coefficients: -2.11e-06 1.88e-08 -1.93e-10 4.01e-07 3.43e-10 0.195 nd: 1.64250 Vd: 58.1 glass_code: 643581 density: 3.76 g/cm3 thermal_expansion: - temperature_range: -30 70 ℃ coefficient: 6.2e-06 K-1 - temperature_range: 20 300 ℃ coefficient: 7.9e-06 K-1 dPgF: -0.0014 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