Optical constants of SUMITA - SK (Dense crown)
K-SK18
Wavelength:
µm
(0.330 – 2.000)
Derived optical constants
n
k
logX
logY
eV
Dispersion formula
$$n^2=2.6383229-0.010806956λ^{2}+0.016153414λ^{-2}+0.00046673954λ^{-4}-2.5414619\text{×}10^{-05}λ^{-6}+1.9703165\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -1.85e-06 1.9e-08 -1.3e-10 4.59e-07 9.89e-10 0.204
nd: 1.63854
Vd: 55.5
glass_code: 639555
density: 3.69 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.8e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.1e-06 K-1
dPgF: -0.0018
climatic_resistance: 3.0
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