Optical constants of SUMITA - LaSF (Lanthanum dense flint)
K-LaSFn7
Wavelength:
µm
(0.300–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=3.0728806-0.014815338λ^{2}+0.024064142λ^{-2}+0.00049961497λ^{-4}+1.2852807\text{×}10^{-06}λ^{-6}+5.2262074\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.19e-06 1.73e-08 -1.56e-10 5.97e-07 3.56e-10 0.161
nd: 1.77250
Vd: 49.6
glass_code: 773496
density: 4.44 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.7e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7.2e-06 K-1
dPgF: -0.0077
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