Andover UV Filters

UV filters are used to isolate specific ultraviolet wavelengths for applications such as semiconductor inspection, laser systems, spectroscopy, medical diagnostics, and UV fluorescence imaging. They block out-of-band light and improve signal-to-noise ratio in UV-based systems.

Andover Corporation’s UV filters span from 193 nm to 380 nm, covering deep UV (DUV), mid-UV, and near-UV regions. Specialized coatings are used for each subrange to ensure optimal performance.

UV filters are fabricated with metal coatings for deep UV and dielectric fluoride coatings for wavelengths above ~260 nm. These are applied using ion-assisted deposition or resistance evaporation depending on the required durability and spectral profile.

A first-surface UV filter has its coating applied to the outermost surface of the substrate, minimizing signal loss and internal reflection. This configuration is ideal for high-intensity applications and where precise beam control is required.

Yes. Andover’s first-surface dielectric coatings are engineered to withstand high laser fluence and are tested for laser damage thresholds where applicable. Custom filters can also be fabricated for specific beam diameters and power levels.

Absolutely. We offer custom shapes, sizes, and spectral profiles, including narrowband and broadband designs, cold mirrors, and neutral density filters for UV. Our in-house team supports rapid prototyping and production for both R&D and high-volume programs.