Optical constants of SUMITA - LaSF (Lanthanum dense flint)
K-LaSFn23
Wavelength:
µm
(0.350 – 2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=3.527437-0.014640706λ^{2}+0.040393831λ^{-2}+0.0015495078λ^{-4}-4.5667249\text{×}10^{-05}λ^{-6}+9.0971269\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.83e-08 1.49e-08 -2.69e-10 8.28e-07 7.87e-10 0.248
nd: 1.91100
Vd: 35.2
glass_code: 911352
density: 4.9 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.9e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.8e-06 K-1
dPgF: -0.0019
climatic_resistance: 1.0
acid_resistance: 1.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book