Optical constants of OHARA - BSL (Borosilicate, low-index)
BSL7Y
Wavelength:
µm
(0.29–2.4)
Complex refractive index (n+ik)
n
k
LogX
LogY
eV
Derived optical constants
Dispersion formula
$$n^2-1=\frac{1.13329383λ^2}{λ^2-0.00669407868}+\frac{0.136897201λ^2}{λ^2-0.023739176}+\frac{0.703456004λ^2}{λ^2-70.7030316}$$Conditions & Spec sheet
n_is_absolute: false
wavelength_is_vacuum: false
temperature: 25.0 °C
thermal_dispersion:
- type: "Schott formula"
coefficients: 2.6e-06 1.69e-08 -4.86e-11 4.34e-07 5.54e-10 0.162
nd: 1.516330
Vd: 64.243778
glass_code: 516643
density: 2.5 g/cm3
thermal_expansion:
- temperature_range: -30 70 °C
coefficient: 6.8e-06 K-1
- temperature_range: 20 300 °C
coefficient: 8.1e-06 K-1
dPgF: -0.0031
climatic_resistance: 1.0
acid_resistance: 1.0
phosphate_resistance: 1.0
Comments
Improved XMT at 365
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 |