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

L-LAL12

Wavelength:
µm

(0.3 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.28516283λ^2}{λ^2-0.00641062082}+\frac{0.478333797λ^2}{λ^2-0.0214815099}+\frac{1.21605301λ^2}{λ^2-100.243378}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 3.27e-07 8.14e-09 -3.58e-11 5.41e-07 7.88e-10 0.181 nd: 1.677900 Vd: 54.887440 glass_code: 678549 glass_status: special density: 3.48 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.6e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 9e-06 K^{-1}dPgF: -0.0069 climatic_resistance: 3.0 acid_resistance: 53.2 phosphate_resistance: 4.0

### 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