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

S-LAH89

Wavelength:
µm

(0.340 – 2.400)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.95118827λ^2}{λ^2-0.00976560799}+\frac{0.377607223λ^2}{λ^2-0.0382232043}+\frac{1.47757262λ^2}{λ^2-112.23672}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 2.88e-06 9.71e-09 -1.22e-11 8.18e-07 8e-10 0.213 nd: 1.851500 Vd: 40.782269 density: 4.7 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 6.8e-06 K^{-1}dPgF: -0.006 climatic_resistance: 2.0 acid_resistance: 4.0 phosphate_resistance: 1.0

### Comments

Recommended

### References

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

See also OHARA glass data sheets