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## Optical constants of OHARA - BAL (Barium, low-index)

S-BAL41

Wavelength:
µm

(0.3 – 2.4)

### Complex refractive index (*n+ik)*

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.243442λ^2}{λ^2-0.0116396708}+\frac{0.166301104λ^2}{λ^2+0.00890464938}+\frac{1.10586114λ^2}{λ^2-114.11122}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 1.27e-06 1.2e-08 -4.09e-11 3.6e-07 6.17e-10 0.254 nd: 1.563839 Vd: 60.666575 glass_code: 564607 density: 2.78 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.5e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 9.1e-06 K^{-1}dPgF: -0.0031 climatic_resistance: 2.0 acid_resistance: 51.2 phosphate_resistance: 3.0

### Comments

Recommended

### References

OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)

See also OHARA glass data sheets