Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK7
Wavelength:
µm
(0.290–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.6835737-0.012086498λ^{2}+0.015193489λ^{-2}+0.00064847987λ^{-4}-5.2423893\text{×}10^{-05}λ^{-6}+2.8301452\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.13e-06 1.62e-08 -5.04e-11 3.71e-07 6.15e-10 0.214
nd: 1.65160
Vd: 58.3
glass_code: 652583
density: 3.76 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.8e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.4e-06 K-1
dPgF: -0.0021
climatic_resistance: 2.0
acid_resistance: 5.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book