Optical constants of SUMITA - LaF (Lanthanum flint)
K-LaF2
Wavelength:
µm
(0.340–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.969235-0.01236657λ^{2}+0.024178838λ^{-2}+0.00087063153λ^{-4}-4.4196612\text{×}10^{-05}λ^{-6}+4.4742987\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -1.89e-06 1.65e-08 -4.35e-11 6.29e-07 6.76e-10 0.223
nd: 1.74400
Vd: 44.9
glass_code: 744449
density: 4.01 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.6e-06 K-1
dPgF: -0.0038
climatic_resistance: 1.0
acid_resistance: 4.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book