Optical constants of SUMITA - LaSK (Lanthanum dense crown)
K-LaSKn1
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=3.0176028-0.01512239λ^{2}+0.021959514λ^{-2}+0.00052144528λ^{-4}-1.8693935\text{×}10^{-05}λ^{-6}+1.6369365\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 9.54e-07 1.19e-08 -2.27e-10 5.55e-07 9.65e-10 0.153
nd: 1.75500
Vd: 52.4
glass_code: 755524
density: 4.51 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.7e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7e-06 K-1
dPgF: -0.009
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