Optical constants of SUMITA - LaSF (Lanthanum dense flint)
K-LaSFn17
Wavelength:
µm
(0.300–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=3.4434117-0.015474743λ^{2}+0.033695975λ^{-2}+0.0012878574λ^{-4}-4.547423\text{×}10^{-05}λ^{-6}+3.867959\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.16e-06 1.35e-08 -2.1e-10 7.19e-07 4.1e-10 0.207
nd: 1.88300
Vd: 40.8
glass_code: 883408
density: 5.54 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7.9e-06 K-1
dPgF: -0.0095
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