Optical constants of SCHOTT - LaK (Lanthanum crown)
LAK9G15
Wavelength:
µm
(0.38–2.5)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.28773667λ^2}{λ^2-0.0055754192}+\frac{0.518244853λ^2}{λ^2-0.0223679524}+\frac{26.1756109λ^2}{λ^2-1892.2533}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
nd: 1.69064
Vd: 54.76
glass_code: 691548.353
glass_status: special
density: 3.525 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.34e-06 K-1
- temperature_range: 20 300 °C
coefficient: 7.56e-06 K-1
dPgF: -0.0055
climatic_resistance: 1.0
stain_resistance: 2.0
acid_resistance: 53.0
alkali_resistance: 1.3
phosphate_resistance: 4.3
Comments
inquiry glass
References
SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com)
See also SCHOTT glass data sheets