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Optical constants of OHARA - LAM (Lanthanum, medium-index)
L-LAM69

Wavelength: µm
 (0.34 – 2.325)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

$$n^2-1=\frac{1.7403896λ^2}{λ^2-0.010339887}+\frac{0.176996917λ^2}{λ^2-0.0484822765}+\frac{1.76775413λ^2}{λ^2-136.671996}$$

Conditions & Spec sheet

n_absolute: false
λ_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
n_d: 1.730770
V_d: 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
ΔP_gF: -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

Data

[Expressions for n]   [CSV - comma separated]   [TXT - tab separated]   [Full database record]

INFO

Ohara Group

Ohara Group is an international group of companies with headquarters in Japan and subsidiaries in Japan (Ohara, Inc.), United States (Ohara Corporation), and Germany (Ohara, GmbH). Ohara manufactures optical and electronic products and also offers measurement services, in particular measurement of refractive indices of solids and liquids.

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