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Optical constants of OHARA - BSM (Borosilicate, medium-index)
S-BSM18

Wavelength: µm
 (0.31 – 2.4)  
 

Derived optical constants

n   k   logX   logY   eV

Dispersion formula [ i ]

$$n^2-1=\frac{0.927886025λ^2}{λ^2-0.00417549199}+\frac{0.708858526λ^2}{λ^2-0.0184691838}+\frac{1.18610897λ^2}{λ^2-122.210416}$$

Conditions & Spec sheet

n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
  - type: "Schott formula"
    coefficients: 3.5e-07 1.22e-08 -3.26e-11 5.94e-07 6.22e-10 0.141
nd: 1.638539
Vd: 55.380028
glass_code: 639554
density: 3.69 g/cm3
thermal_expansion:
  - temperature_range: -30 70 °C
    coefficient: 7e-06 K-1
  - temperature_range: 20 300 °C
    coefficient: 8.4e-06 K-1
dPgF: -0.0035
climatic_resistance: 2.0
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

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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