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

L-BAL35

Wavelength:
µm

(0.3 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.1626263λ^2}{λ^2-0.0125957437}+\frac{0.325661051λ^2}{λ^2+0.0032691105}+\frac{1.35132486λ^2}{λ^2-119.214596}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 5.03e-06 1.22e-08 -3.81e-11 4.93e-07 5.76e-10 0.16 nd: 1.589130 Vd: 61.152601 glass_code: 589612 density: 2.82 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 6.6e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.1e-06 K^{-1}dPgF: -0.0043 climatic_resistance: 3.0 acid_resistance: 52.2 phosphate_resistance: 3.2

### Comments

Low Softening Temperature

### References

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

See also OHARA glass data sheets