Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK14
Wavelength:
µm
(0.310–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.8277206-0.013838479λ^{2}+0.0179847λ^{-2}+0.00057777884λ^{-4}-3.7712827\text{×}10^{-05}λ^{-6}+2.2935918\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -4.5e-07 1.44e-08 -3.03e-10 5.54e-07 7.23e-10 0.135
nd: 1.69680
Vd: 55.6
glass_code: 697556
density: 3.64 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.4e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.1e-06 K-1
dPgF: -0.0065
climatic_resistance: 1.0
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