Optical constants of SCHOTT - LaK (Lanthanum crown)
N-LAK14
Wavelength:
µm
(0.31–2.5)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.50781212λ^2}{λ^2-0.00746098727}+\frac{0.318866829λ^2}{λ^2-0.0242024834}+\frac{1.14287213λ^2}{λ^2-80.9565165}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.68e-06 1.15e-08 -1.44e-11 3.72e-07 5.53e-10 0.226
nd: 1.6968
Vd: 55.41
glass_code: 697554.363
glass_status: standard
density: 3.63 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.5e-06 K-1
- temperature_range: 20 300 °C
coefficient: 6.9e-06 K-1
dPgF: -0.0079
climatic_resistance: 3.0
stain_resistance: 2.0
acid_resistance: 52.3
alkali_resistance: 1.0
phosphate_resistance: 3.0
Comments
References
SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com)
See also SCHOTT glass data sheets