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Optical constants of OHARA - BAL (Barium, low-index)
BAL15Y
Wavelength:
µm
(0.3 – 2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.28348331λ^2}{λ^2-0.00790900515}+\frac{0.102800765λ^2}{λ^2-0.0305971274}+\frac{0.404609885λ^2}{λ^2-46.5268356}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.61e-06 1.32e-08 -4.12e-11 4.65e-07 5.14e-10 0.201
nd: 1.556711
Vd: 58.679177
glass_code: 557587
density: 2.9 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.6e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9e-06 K-1
dPgF: -0.0021
climatic_resistance: 1.0
acid_resistance: 1.2
phosphate_resistance: 1.0
Comments
Improved XMT at 365
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets