Optical constants of SCHOTT - LaK (Lanthanum crown)
N-LAK21
Wavelength:
µm
(0.32–2.5)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.22718116λ^2}{λ^2-0.00602075682}+\frac{0.420783743λ^2}{λ^2-0.0196862889}+\frac{1.01284843λ^2}{λ^2-88.4370099}$$Conditions & Spec sheet
n_absolute: false wavelength_vacuum: false temperature: 20.0 ℃ thermal_dispersion: - type: "Schott formula" coefficients: -2.36e-06 1.15e-08 1.11e-11 3.1e-07 2.78e-10 0.234 nd: 1.64049 Vd: 60.1 glass_code: 640601.374 glass_status: standard density: 3.74 g/cm3 thermal_expansion: - temperature_range: -30 70 ℃ coefficient: 6.8e-06 K-1 - temperature_range: 20 300 ℃ coefficient: 8.1e-06 K-1 dPgF: -0.0017 climatic_resistance: 4.0 stain_resistance: 2.0 acid_resistance: 53.2 alkali_resistance: 4.3 phosphate_resistance: 4.3
Comments
References
SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com)
See also SCHOTT glass data sheets