Optical constants of BK7
Complex refractive index (n+ik)
n k LogX LogY eV
Derived optical constants
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
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets
Ohara GroupOhara 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.
BK7 optical glassBK7 is a very popular crown glass. Most glass makers produce this glass under slightly different names.
Analogs of BK7 glass produced by different makers