Optical constants of OHARA - BAL (Barium, low-index)
BAL15
Wavelength:
µm
(0.3–2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.3876453-0.0097564209λ^{2}+0.01254688λ^{-2}+0.00038108489λ^{-4}-2.3656347\text{×}10^{-05}λ^{-6}+1.5068491\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 3.255e-06 0.0 0.0 0.0 0.0 0.0
nd: 1.556711
Vd: 58.689461
glass_code: 557587
glass_status: preferred
density: 2.92 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.4e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.5e-06 K-1
dPgF: -0.0023
acid_resistance: 2.2
phosphate_resistance: 2.0
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets