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

S-LAL7

Wavelength:
µm

(0.28 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{0.916121247λ^2}{λ^2-0.00395889743}+\frac{0.765948319λ^2}{λ^2-0.0167547425}+\frac{1.27745023λ^2}{λ^2-110.762706}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 5.43e-08 1.3e-08 -3.43e-11 3.49e-07 4.29e-10 0.237 nd: 1.651597 Vd: 58.550655 glass_code: 652585 density: 3.73 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 6.7e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.1e-06 K^{-1}dPgF: -0.0042 climatic_resistance: 2.0 acid_resistance: 53.0 phosphate_resistance: 4.0

### Comments

Recommended

### References

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

See also OHARA glass data sheets