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

L-LAH91

Wavelength:
µm

(0.28 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.26144128λ^2}{λ^2-0.00572512582}+\frac{0.782115273λ^2}{λ^2-0.0219829752}+\frac{1.15823645λ^2}{λ^2-88.04822}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 7.54e-06 1.03e-08 1.85e-11 6.57e-07 6.38e-10 0.204 nd: 1.764500 Vd: 49.096913 density: 4.29 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 5.7e-06 K^{-1}dPgF: -0.0092 climatic_resistance: 2.0 acid_resistance: 52.2 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