These are classic interference filter which will pass light of a narrow bandwidth/ wavelength and reflect/ block all other light. In principle interference filters can be designed and manufactured to almost any specification of centre wavelength and band pass. In practice bespoke/ custom interference filters can be expensive and so should be avoided unless there are real advantages. Although our prices for custom interference filters are extremely competitive and we are happy to produce, it is best to utilise our extensive stock range of interference filters on offer. Our standard range of stock filter are available from 254nm-2000nm in various bandwidths from narrow 3nm FIN type up to 65-100nm FIW type to meet most requirements.Our interference filters are of the higher quality type. Where most manufacturers filters are simply sealed into a metal housing with just resin and so susceptitble to leakage of moisture, our range of interference filters are individual CNC scribed and hermetically sealed (see technical notes below on scribed filters) to form a stack in their rings to ensure maximum long-term stability. Although our standard range of stock interference band pass filters are mounted, un-mounted types with aerospace painted edges can be supplied at special request. These Interference Bandpass Filters are all typically 3-7 cavity. In most cases blocking is Metal-Dielectric from 200nm to Far IR (3000+nm) at OD4.Two issues with interference filters need to be considered, firstly any light not passed is reflected and so attention must be paid to where this light will finish up.
