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Optical constants of OHARA - LAM (Lanthanum, medium-index)
L-LAM72

Wavelength: µm
 (0.29 – 2.4)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

$$n^2-1=\frac{1.50483297λ^2}{λ^2-0.0075034233}+\frac{0.433346414λ^2}{λ^2-0.026900952}+\frac{1.2714921λ^2}{λ^2-95.7631272}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
nd: 1.733099
Vd: 48.896607
glass_code: 733489
glass_status: special
density: 3.89 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 6.6e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8e-06 K-1
dPgF: -0.0093
climatic_resistance: 3.0
acid_resistance: 51.2
phosphate_resistance: 1.2

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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