Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK8
Wavelength:
µm
(0.310–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.8797142-0.015009518λ^{2}+0.01933782λ^{-2}+0.00048379963λ^{-4}-1.1367908\text{×}10^{-05}λ^{-6}+7.0484275\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 9.91e-07 1.3e-08 -2.26e-10 5.21e-07 4.99e-10 0.162
nd: 1.71300
Vd: 53.9
glass_code: 713539
density: 3.79 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 4.9e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7.5e-06 K-1
dPgF: -0.0065
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