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## Optical constants of OHARA - LAH (Lanthanum, high-index)

L-LAH53

Wavelength:
µm

(0.34 – 0.7)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.87409991λ^2}{λ^2-0.00993318344}+\frac{0.297921402λ^2}{λ^2-0.0405501825}+\frac{1.35064285λ^2}{λ^2-100.5022}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 7.31e-06 1.04e-08 -8.93e-12 7.66e-07 7.96e-10 0.229 nd: 1.806249 Vd: 40.907302 glass_code: 806409 density: 4.49 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 5.9e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 7.2e-06 K^{-1}dPgF: -0.0065 climatic_resistance: 1.0 acid_resistance: 51.2 phosphate_resistance: 2.0

### 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