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 Interference Band-pass Filters
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These are classic interference filters 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 filters 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 sceptical 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. Secondly the filter performance is sensitive to incidence angle with the characteristic moving to shorter wavelengths as the incidence angle is increased. Options Available: 12.7mmdia (8.7mm aperture), 25.4mmdia (21.4mm aperture) and 50.8mmdia (46.8mm aperture) are available at short notice normally within 1-2 weeks.
Other bespoke sizes to your specification either mounted or un-mounted are available in small one-off quantity and normally delivered within 6 weeks. Please call or email with your specification Specifications: | Stock size mm: | 12.5mm; 25.0mm; 50mm diameter | | Diameter & Aperture (mm): | 12.5mm ± 0.1 (8.5mm aperture)
25.0mm ± 0.1 (21mm aperture)
50.0mm ± 0.1 (46mm aperture) | | Thickness (mm): | <=6.1mm +0/-0.1 | | Blocking: | <0.01% (OD4) 200nm to 3000 NM 1600nm upwards <0.01% (OD4) 200nm to 2000nm | | CWL tolerance (nm): | ± 20% of FWHM | | HBW tolerance (nm): | ± 20% of FWHM | | Optimum Operating Temperature: | 23°C | | Edge treatment: | Mounted in black anodized aluminium ring | | Edge marking format: | In most cases {Knight Optical Part#} - {KOLTD} - arrow in direction of light path | | Surface/Coating Quality: | 80/50 Per Mil-0-13830A | | Usable Temperature Limits: | -50°C to +80°C | | Design type: | Typical 3 cavity design | | Assembly: | All filters are scribed (SEE DRAWING) and hermetically sealed to ensure maximum long-term stability | For Information about filter terminology click here.
For information about how Scribed Interference Filters are manufactured, click here.
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