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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.

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Knight Optical's broadband and extra broadband range of interference band-pass filters are used to isolate and transmit a specified narrow wavelength and reflect all other incident wavelengths.

Our stock range of high quality visible and NIR filters is available from 400nm - 940nm in various bandwidths to meet most requirements from ANPR imaging to CCTV and high-end surveillance systems. Typically, our filters are 3-7 cavity and in most cases blocking is metal dielectric from 200nm to FIR (3000+nm) at OD4. This broadband range of interference bandpass filter has a standard 60-70% transmission.

All individual mounted interference filters are CNC scribed and hermetically sealed to form a stack in their rings, ensuring maximum long-term stability. Although our standard stock range is mounted, un-mounted types with aerospace paint blackened edges can be supplied at request. 

Our filters are available on short lead times directly from stock, or as custom products designed to fit your specific application. For more information please contact our technical sales team with your requirements.

Diameter & Aperture (mm):


Thickness (mm):
Blocking:


CWL Tolerance (nm):
HBW Tolerance (nm):
Optimum Operating temperature:
Edge Treatment:
Edge Marking Format:
Surface Quality:
Usable Temperature Limits:
Design Type:
Assembly:
12.5mm ± 0.2 (8.5mm aperture)
25.0mm ± 0.2 (21mm aperture)
50.0mm ± 0.2 (46mm aperture)
6.1mm +/-0.2
<0.01% (OD4) @ 200nm to 1150nm (for filters with CWL less than 380nm)
<0.001% (OD5) @ 200nm to 1150nm (for filters with CWL between 380nm and 1064)
<0.001% (OD5) @ 200nm to 1850nm (for filters with CWL between 1080nm and 1640)
± 20% of FWHM
± 20% of FWHM
23°C
Mounted in black anodized aluminium ring
In most cases {Knight Optical Part#} - {KOLTD} - arrow in direction of light path
80/50
-50°C to +80°C
Typical 3 cavity design
All filters are scribed and hermetically sealed to ensure maximum long-term stability
(Information sheet on scribed interference filters)

Please telephone our technical sales or email with your specification.

Dielectrically blocked filters are available for increased performance.
Stock filters can be supplied in pre-mounted threaded rings.
Other bespoke sizes to your specification either mounted or un-mounted.
Unmounted interference filters available, sealed around edges with high quality aerospace paint.
Small one-off or small batch quantity for new projects at very competitive prices and normally delivered within 6 weeks.
Alternative imperial sizes are available at short notice, normally within 1-2 weeks.
12.7mm dia: 8.7mm dia aperture
25.4mm dia: 21.4mm dia aperture
50.8mm dia: 46.8mm dia aperture

 

Information sheet: Interference filter terminology

Information sheet: Scribed interference filters

107 Items

Name CWL(nm) Peak Transmission (%) FWHM Diameter (mm) Thickness (mm) Mounted/Unmounted Blocking Type Avg. Blocking Range Avg. Blocking OD Price Buy
450DIR12 pdf 450 60 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
450DIR25 pdf 450 60 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
450DIR50 pdf 450 60 40 50 6.1 Mounted Dielectric 200nm to 1150nm 5
$289.68
500FIR12 pdf 500 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
500DIR12 pdf 500 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
500FIR25 pdf 500 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
500DIR25 pdf 500 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
500FIR50 pdf 500 70 40 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
500DIW12 500 70 70 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
500FIW25 pdf 500 70 70 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
550DIR12 pdf 550 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
550DIR25 pdf 550 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
550FIR50 pdf 550 70 40 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
550DIW12 pdf 550 70 70 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
550DIW25 pdf 550 70 70 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
570DIR12 pdf 570 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
570FIR12 pdf 570 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
570FIR25 pdf 570 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
600DIR12 pdf 600 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
600FIR12 pdf 600 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
600DIR25 pdf 600 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
600FIR25 pdf 600 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
600DIW12 pdf 600 70 65 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
600DIW25 pdf 600 70 65 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
600FIW25 pdf 600 70 65 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
633DIR12 pdf 633 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
633DIR25 pdf 633 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
633FIR25 pdf 633 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
650DIR12 pdf 650 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
650DIR25 pdf 650 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
650FIR50 pdf 650 70 40 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
650DIW12 pdf 650 70 75 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
650DIW25 pdf 650 70 75 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
650FIW25 pdf 650 70 75 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
660DIR25 pdf 660 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
660FIR25 pdf 660 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
670DIR12 pdf 670 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
670DIR25 pdf 670 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
670FIR50 pdf 670 70 40 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
670FIW25 pdf 670 70 75 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
700DIR12 pdf 700 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
700FIR12 pdf 700 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
700DIR25 pdf 700 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
700FIR25 pdf 700 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
700DIW12 pdf 700 70 70 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
700DIW25 pdf 700 70 70 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
730FIR12 pdf 730 70 30 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
730FIR50 pdf 730 70 30 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
750DIR12 pdf 750 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
750FIR12 pdf 750 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
750DIR25 pdf 750 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
750DIW12 pdf 750 70 65 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
750FIW12 pdf 750 70 65 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
750DIW25 pdf 750 70 65 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
750FIW25 pdf 750 70 65 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
780DIR12 pdf 780 70 30 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
780FIR12 pdf 780 70 30 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
780FIR25 pdf 780 70 30 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
780FIR50 pdf 780 70 30 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
790FIW25 pdf 790 70 60 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
800DIR12 pdf 800 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
800FIR12 pdf 800 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
800DIR25 pdf 800 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
800FIR25 pdf 800 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
800FIR50 pdf 800 70 40 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
800FIW25 pdf 800 70 65 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
810DIR12 pdf 810 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
810FIR12 pdf 810 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
810DIR50 pdf 810 70 40 50 6.1 Mounted Dielectric 200nm to 1150nm 5
$289.68
810FIR50 pdf 810 70 40 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
820DIW12 pdf 820 70 75 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
820FIW12 pdf 820 70 75 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
820DIW25 pdf 820 70 75 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
820FIW50 pdf 820 70 65 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
830DIR12 pdf 830 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
830FIR12 pdf 830 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
830DIR25 pdf 830 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
830FIR25 pdf 830 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
850DIR12 pdf 850 70 40 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
850FIR12 pdf 850 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
850DIR25 pdf 850 70 40 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
850FIR25 pdf 850 70 40 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
850DIW12 pdf 850 70 70 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
850FIW12 pdf 850 70 70 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
850DIW25 pdf 850 70 70 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
850FIW25 pdf 850 70 70 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
850FIW50 pdf 850 70 70 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
870FIR12 pdf 870 70 40 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
880FIW12 pdf 880 70 70 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
880FIW50 pdf 880 70 70 50 6.1 Mounted Silver 200nm to 1150nm 5
$260.63
900FIR12 pdf 900 70 45 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
900DIW12 pdf 900 70 60 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
900FIW12 pdf 900 70 60 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
900DIW25 pdf 900 70 60 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
905FIR12 pdf 905 70 45 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
905FIR25 pdf 905 70 45 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
940DIR12 pdf 940 70 45 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
940FIR12 pdf 940 70 45 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
940DIW12 pdf 940 70 60 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
940DIW25 pdf 940 70 60 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
940FIW25 pdf 940 70 60 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
950DIW12 pdf 950 70 65 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
950FIW12 pdf 950 70 65 12.5 6.1 Mounted Silver 200nm to 1150nm 5
$57.27
950DIW25 pdf 950 70 65 25 6.1 Mounted Dielectric 200nm to 1150nm 5
$129.97
950FIW25 pdf 950 70 65 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97
960DIW12 pdf 960 70 65 12.5 6.1 Mounted Dielectric 200nm to 1150nm 5
$71.59
990FIW25 pdf 990 70 70 25 6.1 Mounted Silver 200nm to 1150nm 5
$103.97

107 Items

1

Broadband Interference Bandpass Filters

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