Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK6
Wavelength:
µm
(0.300–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.6532657-0.011570116λ^{2}+0.015955637λ^{-2}+0.00023811283λ^{-4}+1.7165459\text{×}10^{-05}λ^{-6}-1.4129709\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 20.0 ℃
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.11e-06 1.88e-08 -1.93e-10 4.01e-07 3.43e-10 0.195
nd: 1.64250
Vd: 58.1
glass_code: 643581
density: 3.76 g/cm3
thermal_expansion:
- temperature_range: -30 70 ℃
coefficient: 6.2e-06 K-1
- temperature_range: 20 300 ℃
coefficient: 7.9e-06 K-1
dPgF: -0.0014
acid_resistance: 4.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book