Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaKn4
Wavelength:
µm
(0.310–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.744955-0.013026744λ^{2}+0.016661518λ^{-2}+0.00048278001λ^{-4}-2.5815825\text{×}10^{-05}λ^{-6}+1.5241247\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -1.88e-06 1.19e-08 -1.1e-10 3.48e-07 6.14e-10 0.223
nd: 1.67100
Vd: 57.2
glass_code: 671572
density: 3.88 g/cm3
thermal_expansion:
- temperature_range: 20 300 °C
coefficient: 8.5e-06 K-1
dPgF: -0.0038
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