Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaKn2
Wavelength:
µm
(0.290–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.6498456-0.013078949λ^{2}+0.014887079λ^{-2}+0.0003621869λ^{-4}-1.1506273\text{×}10^{-05}λ^{-6}+6.1300945\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.24e-06 1.48e-08 -2.56e-10 3.66e-07 4.69e-10 0.182
nd: 1.64050
Vd: 60.1
glass_code: 641601
density: 3.66 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.9e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8e-06 K-1
dPgF: -0.0029
climatic_resistance: 1.0
acid_resistance: 5.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book