Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaKn7
Wavelength:
µm
(0.340–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.735741-0.011476747λ^{2}+0.017975035λ^{-2}+0.00072020288λ^{-4}-5.1933951\text{×}10^{-05}λ^{-6}+3.5980087\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.14e-07 1.48e-08 -1.61e-10 5.55e-07 4.75e-10 0.191
nd: 1.67000
Vd: 51.7
glass_code: 670517
density: 3.78 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.5e-06 K-1
dPgF: -0.0042
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