Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK11
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.703071-0.011555097λ^{2}+0.016440907λ^{-2}+0.00044044678λ^{-4}-2.1866961\text{×}10^{-05}λ^{-6}+1.3531002\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.69e-06 1.38e-08 -5.45e-11 4.86e-07 7.71e-10 0.155
nd: 1.65830
Vd: 57.3
glass_code: 658573
density: 3.85 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.6e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.5e-06 K-1
dPgF: -0.004
climatic_resistance: 1.0
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