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Optical constants of OHARA - LAL (Lanthanum, low-index)
LAL58
Wavelength:
µm
(0.3 – 2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.53415λ^2}{λ^2-0.008014497}+\frac{0.2744946λ^2}{λ^2-0.03023701}+\frac{1.210527λ^2}{λ^2-118.7442}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: -1.2389e-06 0.0 0.0 0.0 0.0 0.0
nd: 1.693495
Vd: 50.807634
glass_code: 694508
glass_status: preferred
density: 4.11 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.8e-06 K-1
- temperature_range: 20 300 °C
coefficient: 9.1e-06 K-1
dPgF: -0.0036
acid_resistance: 53.2
phosphate_resistance: 4.2
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets