Optical constants of SUMITA - LaSF (Lanthanum dense flint)
K-LaSFn22
Wavelength:
µm
(0.350 – 2.000)
Derived optical constants
n
k
logX
logY
eV
Dispersion formula
$$n^2=3.477103-0.01493764λ^{2}+0.040192699λ^{-2}+0.0018404932λ^{-4}-0.00010009344λ^{-6}+1.4346776\text{×}10^{-05}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.02e-06 1.36e-08 -2.8e-10 8.48e-07 8.18e-10 0.256
nd: 1.89800
Vd: 34.0
glass_code: 898340
density: 4.92 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.7e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7.9e-06 K-1
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