Optical constants of CDGM - LAK (Lanthanum crown)
D-LAK70
Wavelength:
µm
(0.280–2.400)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{0.616886534λ^2}{λ^2-0.000249888602}+\frac{1.11924765λ^2}{λ^2-0.0158113883}+\frac{1.29814839λ^2}{λ^2-102.017679}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.1e-06 1.31e-08 -3.75e-11 5.42e-07 6.96e-10 0.177
nd: 1.669100
Vd: 55.389689
glass_code: 669554
density: 3.35 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9.1e-06 K-1
dPgF: -0.0066
climatic_resistance: 1.0
Comments
anneal rate:4°C/h
References
CDGM Zemax catalog 2022-06 (obtained from http://www.cdgmgd.com)
See also CDGM optical glass data sheets