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Refractive index database

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Optical constants of OHARA - BAL (Barium, low-index)
BAL2

Wavelength: µm
 (0.350 – 0.9)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula

$$n^2=2.424312-0.00858474λ^{2}+0.01472045λ^{-2}+0.0005504561λ^{-4}-3.170738\text{×}10^{-05}λ^{-6}+2.420757\text{×}10^{-06}λ^{-8}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 4.152e-06 0.0 0.0 0.0 0.0 0.0
nd: 1.570989
Vd: 50.797474
glass_code: 571508
glass_status: preferred
density: 3.1 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 1e-05 K-1
  - temperature_range: 20 300 °C
    coefficient: 1.16e-05 K-1
dPgF: -0.0007

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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