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

S-LAL12

Wavelength:
µm

(0.28 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{0.992053895λ^2}{λ^2-0.0167095063}+\frac{0.771377731λ^2}{λ^2-0.00236750156}+\frac{1.18296264λ^2}{λ^2-105.90108}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: -2.18e-06 1.12e-08 -3.73e-11 3.25e-07 4.77e-10 0.27 nd: 1.677900 Vd: 55.341195 glass_code: 678553 density: 4.01 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.2e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.6e-06 K^{-1}dPgF: -0.0047 climatic_resistance: 2.0 acid_resistance: 53.0 phosphate_resistance: 4.2

### Comments

Recommended

### References

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

See also OHARA glass data sheets