Optical constants of CDGM - LAK (Lanthanum crown)
H-LAK4L
Wavelength:
µm
(0.280–2.400)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{0.402312889λ^2}{λ^2+0.00267679247}+\frac{1.24575177λ^2}{λ^2-0.013171611}+\frac{1.28904431λ^2}{λ^2-93.3654804}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.06e-06 1.84e-08 -7.4e-11 2.79e-07 6.19e-10 0.275
nd: 1.640000
Vd: 60.202769
glass_code: 640602
density: 2.99 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7.8e-06 K-1
dPgF: -0.006
climatic_resistance: 3.0
References
CDGM Zemax catalog 2022-06 (obtained from http://www.cdgmgd.com)
See also CDGM optical glass data sheets