Knight Optical (USA)


Request Information

UV Fused Silica Lenses for Flame Detection

UV Fused Silica can be used in Flame Detection Applications, due to its high transmission into the NIR range (approximately <92% avg 400-2000nm) meaning that a clear distinction can be made between different wavelengths of light.

UV FS also has a very low coefficient of thermal expansion 0.55x10-6K-1 at 300K) compared to N-BK7 (7.1x10-6K-1), meaning that it can still provide optical performance under high temperature. UV FS also has a high melting point compared to N-BK7, providing further protection for your application in high temperature environments.

UV FS is comparable to N-BK7 or other similar optical glasses in its performance, having a very similar average transmission over the VIS range up to approximately 2000nm and a slightly lower refractive index. The Abbe
constants of UV FS are also very similar to that of N-BK7, although slightly higher.

Typical specs:
UV Grade Fused Silica
Operating Wavelength 587nm
Diameter Tolerance: 0 / -0.10mm
Centring Tolerance <5 arc min
Focal Length Tolerance: ± 0.2mm (<10mm) ±2.0% (10mm – 1000mm)
Centre Thickness Tolerance ±0.2mm
Surface Figure 3/ 3 (1)
Surface Quality: <40-20 Scratch/Dig
Coating: Optional

All our UV Fused Silica Lenses are fully inspected on their quality in our ISO 9001 certified, state-of-theart Metrology laboratory, using our Trioptics Optispheric, and Starrett AV300 and Zygo Verifire XPZ. This
allows us to work to the highest QA standards and meet the tolerance specifications on these precision components.


Contact our technical sales team to discover how Knight Optical’s high quality UV FS lenses and superior service can improve your instrumentation and supply chain experience.
UK, Europe, Asia & RoW: E-Mail Tel 44 (0)1622 859444
USA & Canada: E-Mail Tel 001 401-583-7846

What’s new

Search all our content