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Optical constants of OHARA - LAL (Lanthanum, low-index)
S-LAL18
Wavelength:
µm
(0.28 – 2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.50276318λ^2}{λ^2-0.0145462356}+\frac{0.430224497λ^2}{λ^2+0.00332784153}+\frac{1.3472606λ^2}{λ^2-93.3508342}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.46e-06 1.15e-08 -3.23e-12 6.57e-07 8.65e-10 0.0
nd: 1.729157
Vd: 54.680013
glass_code: 729547
density: 4.18 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 5.9e-06 K-1
- temperature_range: 20 300 °C
coefficient: 6.9e-06 K-1
dPgF: -0.0086
climatic_resistance: 1.0
acid_resistance: 51.2
phosphate_resistance: 2.0
Comments
Recommended
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets