Optical constants of HIKARI - BK (Borosilicate crown)
J-BK7A
Wavelength:
µm
(0.280–2.400)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2=2.27110883-0.00938988354λ^{2}-0.000100277081λ^{4}+0.0109572221λ^{-2}+0.000120210067λ^{-4}+3.31079774\text{×}10^{-06}λ^{-6}-1.48235581\text{×}10^{-08}λ^{-8}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 23.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 8.20811e-07 8.68946e-09 -1.28363e-13 5.04167e-07 5.18196e-10 0.147522
nd: 1.516800
Vd: 64.129950
density: 2.51 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.4e-06 K-1
dPgF: -0.001
phosphate_resistance: 1.0
References
NIKON Zemax catalog 2017-11 (obtained from http://www.nikon.com)
See also HIKARI glass data sheets
Data
INFO
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 |
External links
Hikari Glass Co., Ltd.
Hikari Glass Co., Ltd. is a Japanese glass maker, a subsidiary of Nikon Corp.External links
- Hikari Glass Co., Ltd. (in Japanese)
- Nikon