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

S-LAL19

Wavelength:
µm

(0.280 – 2.400)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{0.973997577λ^2}{λ^2-0.00379332678}+\frac{0.958186322λ^2}{λ^2-0.0177574581}+\frac{1.20163359λ^2}{λ^2-83.79896}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 4.19e-06 1.04e-08 7.25e-13 4.73e-07 4.97e-10 0.202 nd: 1.729160 Vd: 54.095223 density: 3.98 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 5.4e-06 K^{-1}dPgF: -0.0092 climatic_resistance: 3.0 acid_resistance: 52.0 phosphate_resistance: 2.0

### Comments

Recommended

### References

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

See also OHARA glass data sheets