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## Optical constants of OHARA - LAL (Lanthanum, low-index)

S-LAL58

Wavelength:
µm

(0.32 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.06368789λ^2}{λ^2-0.018519964}+\frac{0.744939067λ^2}{λ^2-0.00116295862}+\frac{1.59178942λ^2}{λ^2-156.636025}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -6.04e-07 8.69e-09 -3.71e-11 6.22e-07 5.61e-10 0.185 nd: 1.693495 Vd: 50.810652 glass_code: 694508 density: 4.03 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.5e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.6e-06 K^{-1}dPgF: -0.0047 climatic_resistance: 3.0 acid_resistance: 52.2 phosphate_resistance: 2.2

### Comments

Recommended

### References

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

See also OHARA glass data sheets