Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaKn14
Wavelength:
µm
(0.280–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.9713549-0.015047149λ^{2}+0.020748381λ^{-2}+0.00068239287λ^{-4}-4.5897244\text{×}10^{-05}λ^{-6}+3.0151479\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 20.0 ℃
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.61e-06 1.71e-08 -9.82e-11 5.38e-07 2.35e-11 0.138
nd: 1.74100
Vd: 52.7
glass_code: 741527
density: 4.31 g/cm3
thermal_expansion:
- temperature_range: -30 70 ℃
coefficient: 5.8e-06 K-1
- temperature_range: 20 300 ℃
coefficient: 7.4e-06 K-1
dPgF: -0.0095
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