N-BK7 Windows
Tuniu supplies both uncoated optical windows and components with broadband anti-reflection coatings covering multiple spectral bands: 350–700 nm, 650–1100 nm, 1050–1700 nm.
N-BK7 is a widely used borosilicate crown optical glass, delivering outstanding optical performance with cost-effectiveness. It features superior homogeneity, minimal bubbles and inclusions, and excellent machinability, making it an ideal lens substrate for visible and near-infrared systems. For applications without stringent requirements on ultraviolet transmittance and low thermal expansion coefficient, N-BK7 serves as a cost-effective alternative to UV fused silica.
Tuniu provides high-precision optical windows in a variety of substrate materials, along with custom solutions for special dimensions and coating specifications. Please contact our technical team for your customized requirements.
Parameters
| Optical material | N-BK7 | Diameter tolerance | + 0.00/- 0.20 mm |
| Thickness tolerance | ± 0.3 mm | Surface parallelism | ≤ 5 arcsec |
| Surface flatness(@633 nm) | λ/10 | Surface smoothness (scratches/pitting) | 20/10 |
Model
| Size, Dia. X T, mm | Working Wavelength, nm |
| 12.7 x 3.0 | Uncoated(350-2000 nm), AR350–700 nm, AR650–1100 nm, AR1050–1700 nm |
| 25.4 x 5.0 |