Optical constants of SUMITA - LaSF (Lanthanum dense flint)
K-LaSFn4
Wavelength:
µm
(0.310 – 2.000)
Derived optical constants
n
k
logX
logY
eV
Dispersion formula
$$n^2=3.1049984-0.013342479λ^{2}+0.027506526λ^{-2}+0.00075451621λ^{-4}-1.6565687\text{×}10^{-05}λ^{-6}+2.780481\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -6.24e-07 1.69e-08 -1.42e-10 6.93e-07 1.19e-09 0.208
nd: 1.78500
Vd: 43.7
glass_code: 785437
density: 4.12 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.9e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.3e-06 K-1
dPgF: -0.0078
climatic_resistance: 1.0
acid_resistance: 3.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book