Europe, UK, Asia & RoW: [email protected] +44 (0)1622 859444 | USA & Canada: [email protected] +1 401-583-7846

BREXIT UPDATE: Knight Optical will continue to provide quality assured service for all your optical requirements both custom & stock. We will handle all requirements caused by the new regulations.


Looking For a Custom Optical Solution? Enquire

UV Filters

Optical bandpass filters for Electronics & Optoelectronics for industryOptical Filters are used to control the spectral content of a light beam, attenuate unwanted light and pass wanted light.

Knight Optical supply a range of custom UV grade optical filters specifically suited to ultraviolet wavelengths to meet a host of UV applications.  Our custom ranges of UV optical bandpass filters are specifically for UV wavelengths and are optical filters for passing selected wavelength while attenuating (blocking) unwanted shorter and longer wavelengths from 214nm to 400nm.  Our range of custom neutral density filters is useful from 200nm to 2650nm.

Custom UV interference bandpass filters:  Our high quality custom UV range of interference bandpass filters pass light of a narrow bandwidth/ wavelength and reflect/ block all other light. Although our standard stock range of UV interference band pass filters is mounted we are able to supply custom un-mounted types with aerospace painted edges. Our custom range of UV Interference bandpass filters is typically 3-7 cavity.  In most cases the blockers are metal based from 200nm to Far IR (3000+nm) at OD4.  However custom filters can be manufactured with dielectric blocking for even longer extended life spans.

Custom UV colourglass bandpass filters:   Our range of custom UV type colour glass bandpass filters are polished sheets of special glass that have been cast with a dye included in it. These filters have uniform spectral transmission properties over their entire aperture.   Although we are restricted by Schott glass manufacturing capabilities of offering 165x165mm ground plates for processing, alternative manufacturers are now available that have replacement alternatives.  In these cases we are able to manufacture custom colour glass filters up to 300mm square.  These can be custom processed to any shape or size you require.

Custom UV grade metallic neutral density filters:  UV grade metallic ND filters are manufactured by vacuum coating a thin metallic layer onto a UV grade fused silica polished window.
As UV grade fused silica performs efficiently at 175nm it is an excellent choice of substrate for custom UV grade metallic neutral density filters.  There are no restrictions on size for custom UV neutral density filters and sensible sizes can be supplied up to 250-300mm square.

Knight Optical supply high quality custom UV optical filters made to our exact specification. Every component is individually tested on our Agilent Cary 5000 spectrophotometers fitted with UMA and DRA devices which operates from 175nm to 3300nm.  Our Agilent 660 FTIR spectrophotometer is used for testing materials between 3.5µm and 45µm.  All tested by our highly skilled technicians in our state of art metrology lab to ensure all components meet our high quality standards.

Contact our multilingual technical sales team and discover how Knight Optical’s high quality custom UV grade optical filters can improve your product and supply chain experience.

Our 2022/2023 Catalogue

Inside Knight Optical’s catalogue you’ll find details of the industries we serve as well as the many other services we can offer. It also showcases hundreds of our most popular products, supported by useful technical information, to help you choose the right part for your application.
Click below to view our digital catalogue now.

view our catalogue