Optical constants of CDGM - LAK (Lanthanum crown)
H-LAK5A
Wavelength:
µm
(0.290–2.400)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.54437415λ^2}{λ^2-0.00815901025}+\frac{1.00066972λ^2}{λ^2-88.9110754}+\frac{0.219123775λ^2}{λ^2-0.0267011064}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -4.1e-06 1.07e-08 -1.69e-11 5.87e-07 1.27e-09 0.095
nd: 1.677900
Vd: 55.514970
glass_code: 678555
density: 3.8 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 8e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9.4e-06 K-1
dPgF: -0.0049
climatic_resistance: 2.0
References
CDGM Zemax catalog 2022-06 (obtained from http://www.cdgmgd.com)
See also CDGM optical glass data sheets