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## Optical constants of OHARA - LAM (Lanthanum, medium-index)

S-LAM55

Wavelength:
µm

(0.35 – 2.4)

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

n
k
LogX
LogY
eV

### Derived optical constants

### Dispersion formula

$$n^2-1=\frac{1.85412979λ^2}{λ^2-0.0108438152}+\frac{0.165450323λ^2}{λ^2-0.051405098}+\frac{1.27255422λ^2}{λ^2-109.986837}$$### Conditions & Spec sheet

n_absolute: false wavelength_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 1.27e-06 1.14e-08 -3.64e-11 6.01e-07 7.23e-10 0.278 nd: 1.762001 Vd: 40.100176 glass_code: 762401 density: 4.22 g/cm^{3}thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.1e-06 K^{-1}- temperature_range: 20 300 °C coefficient: 8.4e-06 K^{-1}dPgF: -0.0001 climatic_resistance: 2.0 acid_resistance: 51.2 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