These Interference Bandpass Filters are used to isolate and transmit a narrow wavelength that is required and block all other wavelengths through reflection and blocking. 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. Knight Optical standard range of Interference Band-pass Filters consist of an all-dielectric coating along with other coatings for additional blocking. The individual filters are CNC scribed and hermetically sealed 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. 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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25mmdia Type - Interference Filters - Standard IR Range (10-18nmBW)
