Optical constants of BK7
K-BK7 (SUMITA)
Wavelength:
µm
(0.290–2.000)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.2705778-0.010059376λ^{2}+0.010414999λ^{-2}+0.00028872517λ^{-4}-2.2214495\text{×}10^{-05}λ^{-6}+1.4258559\text{×}10^{-06}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 20.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 6.84e-07 2.05e-08 -1.55e-10 4.18e-07 2.74e-10 0.178
nd: 1.51633
Vd: 64.1
glass_code: 516641
density: 2.52 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.3e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.5e-06 K-1
dPgF: -0.0014
climatic_resistance: 1.0
acid_resistance: 1.0
References
SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp)
See also SUMITA optical glass data book
Data
INFO
SUMITA Optical Glass, Inc.
SUMITA Optical Glass, Inc. is a Japanese glass manufacturerExternal 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 |