Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaKn5
Wavelength:
µm
(0.330–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.6761221-0.012108757λ^{2}+0.016143507λ^{-2}+0.00051920927λ^{-4}-2.8395319\text{×}10^{-05}λ^{-6}+1.8554978\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -8.68e-07 1.28e-08 -1.92e-10 5.01e-07 9.91e-10 0.169
nd: 1.65000
Vd: 55.8
glass_code: 650558
density: 3.71 g/cm3
thermal_expansion:
- temperature_range: 20 300 °C
coefficient: 8e-06 K-1
dPgF: -0.0011
climatic_resistance: 2.0
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