Optical constants of SUMITA - LaK (Lanthanum crown)
K-LaK10
Wavelength:
µm
(0.310–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.8960747-0.011713123λ^{2}+0.021599254λ^{-2}+0.00043811038λ^{-4}+5.752903\text{×}10^{-06}λ^{-6}-1.7364157\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -2.63e-06 2.02e-08 -6.98e-11 5.94e-07 9.57e-10 0.184
nd: 1.72000
Vd: 50.3
glass_code: 720503
density: 4.08 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.2e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.6e-06 K-1
dPgF: -0.0066
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