Optical constants of OHARA - BSL (Borosilicate, low-index)
BSL7
Wavelength:
µm
(0.334 – 2.325)
Derived optical constants
n
k
logX
logY
eV
Dispersion formula
$$n^2=2.2697665-0.0096395197λ^{2}+0.011025458λ^{-2}+7.9465126\text{×}10^{-05}λ^{-4}+1.0120957\text{×}10^{-05}λ^{-6}-4.4096694\text{×}10^{-07}λ^{-8}$$Conditions & Spec sheet
n_absolute: false
wavelength_vacuum: false
temperature: 25.0 °C
nd: 1.516330
Vd: 64.150145
glass_code: 516642
glass_status: preferred
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 7.4e-06 K-1
References
OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA 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 |