Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK12
Wavelength:
µm
(0.310–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.7644388-0.011785176λ^{2}+0.017957173λ^{-2}+0.00034733134λ^{-4}+3.6439617\text{×}10^{-06}λ^{-6}-3.286378\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -3.52e-06 1.96e-08 -6.9e-11 5.11e-07 4.65e-10 0.152
nd: 1.67790
Vd: 55.5
glass_code: 678555
density: 3.98 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.9e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.1e-06 K-1
dPgF: -0.0018
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