Optical constants of CDGM - LAK (Lanthanum crown)
D-LAK5-25
Wavelength:
µm
(0.280–2.400)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{0.60236351λ^2}{λ^2-3.07499779\text{×}10^{-08}}+\frac{1.15823046λ^2}{λ^2-0.0158379352}+\frac{1.30267215λ^2}{λ^2-101.976296}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.76e-06 1.72e-08 -6.77e-11 3.92e-07 6.44e-10 0.23
nd: 1.676860
Vd: 54.805426
glass_code: 677548
density: 3.37 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9.4e-06 K-1
dPgF: -0.0069
climatic_resistance: 1.0
Comments
anneal rate:25°C/h
References
CDGM Zemax catalog 2022-06 (obtained from http://www.cdgmgd.com)
See also CDGM optical glass data sheets