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Optical constants of OHARA - LAM (Lanthanum, medium-index)
L-LAM69
Wavelength:
µm
(0.34 – 2.325)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.7403896λ^2}{λ^2-0.010339887}+\frac{0.176996917λ^2}{λ^2-0.0484822765}+\frac{1.76775413λ^2}{λ^2-136.671996}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 1.81e-07 7.4e-09 -3.48e-11 7.12e-07 8.78e-10 0.249
nd: 1.730770
Vd: 40.508156
glass_code: 731405
density: 3.24 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 8.6e-06 K-1
- temperature_range: 20 300 °C
coefficient: 1.05e-05 K-1
dPgF: -0.0031
climatic_resistance: 2.0
acid_resistance: 52.2
phosphate_resistance: 3.1
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