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