N-BK7 (CDGM H-K9L)
N-BK7 is a borosilicate crown glass, it is probably the most common optical glass used in high-quality optical components. N-BK7 is a hard glass that can withstand a variety of physical and chemical stressors. It is relatively scratch and chemical resistant. It also has a low bubble and inclusion content, making it a useful glass for precision lenses.
Material Properties
Refractive Index (nd)
1.517 at d-line (587.6nm)
Abbe Number (Vd)
64.17
Thermal Expansion Coefficient (CTE)
7.1 X 10-6 /℃
Density
2.52 g/cm3
Transmission Regions & Applications
| Optimum Transmission Range | Ideal Applications |
| 330 nm - 2.1 μm | in Visible and NIR applications |
Graph
The right graph is transmission curve of 10 mm thick, uncoated NBK-7 substrate
CDGM H-K9L is the Chinese equivalent material of N-BK7, we default to use CDGM H-K9L to substitute N-BK7 material, it is low-cost optical glass.
Material Properties
Refractive Index (nd)
1.5168 @587.6 nm
Abbe Number (Vd)
64.20
Thermal Expansion Coefficient (CTE)
7.1X10-6/℃
Density
2.52 g/cm3
Transmission Regions & Applications
| Optimum Transmission Range | Ideal Applications |
| 330 nm - 2.1μm |
Low-cost material in Visible and NIR applications Used in machine vision, microscopy, industrial applications |
Graph
The right graph is transmission curve of uncoated CDGM H-K9L substrate (10mm thick sample)
For more in-depth specification data, please view our catalog optics to see our complete selection of optics made from CDGM H-K9L.
