Optical constants of CDGM - LAK (Lanthanum crown)
H-LAK12
Wavelength:
µm
(0.290–2.400)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{0.786703112λ^2}{λ^2-0.00202073208}+\frac{1.21770392λ^2}{λ^2-86.703479}+\frac{1.04086924λ^2}{λ^2-0.0163643393}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -1.86e-07 1.39e-08 -1.79e-11 4.74e-07 4.36e-10 0.167
nd: 1.696800
Vd: 56.175305
glass_code: 697562
density: 3.71 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.4e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8e-06 K-1
dPgF: -0.0071
climatic_resistance: 1.0
References
CDGM Zemax catalog 2022-06 (obtained from http://www.cdgmgd.com)
See also CDGM optical glass data sheets