Optical constants of BK7
S-BSL7 (OHARA)
Wavelength:
µm
(0.29–2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.1515019λ^2}{λ^2-0.010598413}+\frac{0.118583612λ^2}{λ^2+0.011822519}+\frac{1.26301359λ^2}{λ^2-129.617662}$$Conditions & Spec sheet
n_is_absolute: false wavelength_is_vacuum: false temperature: 25.0 °C thermal_dispersion: - type: "Schott formula" coefficients: 1.7e-06 1.43e-08 -4.27e-11 4.08e-07 6.74e-10 0.201 nd: 1.516330 Vd: 64.142022 glass_code: 516641 density: 2.52 g/cm3 thermal_expansion: - temperature_range: -30 70 °C coefficient: 7.2e-06 K-1 - temperature_range: 20 300 °C coefficient: 8.6e-06 K-1 dPgF: -0.0024 climatic_resistance: 1.0 acid_resistance: 1.0 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
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.External links
BK7 optical glass
BK7 is a very popular crown glass. Most glass makers produce this glass under slightly different names.Analogs of BK7 glass produced by different makers
Maker | Glass |
---|---|
SCHOTT | N-BK7 |
OHARA | S-BSL7 |
HIKARI | J-BK7A |
CDGM | H-K9L |
HOYA | BSC7 |
SUMITA | K-BK7 |
LZOS | K8 |