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This range of interference band-pass filters are used to isolate and transmit a specified narrow wavelength and reflect all other incident wavelengths in the spectrum

Typically, our filters are 3-7 cavity and in most cases blocking is metal dielectric from 200nm to FIR (3000+nm) at OD4. We can also supply interference bandpass filters with dielectric blocking on request.

The individual 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.  All our interference bandpass filters are supplied with a transmission curve; ASCI files are available on request.

For more information on our stock range of narrowband filters, or to enquire about a custom quote, please contact our technical sales team.

Diameter & Aperture (mm):

Thickness (mm):

CWL Tolerance (nm):

HBW Tolerance (nm):
Optimum Operating temperature:
Edge Treatment:
Edge Marking Format:

Surface Quality:
Usable Temperature Limits:
Design Type:
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
Mounted in black anodized aluminium ring
In most cases {Knight Optical Part#} - {KOLTD} - arrow in direction of light path
-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

9 Items

Name CWL(nm) Peak Transmission (%) FWHM Diameter (mm) Thickness (mm) Blocking Type Avg. Blocking Range Avg. Blocking OD Price Buy
515FIN25 pdf 514.5 55 3 25 6.1 Silver 200nm to 1150nm 5
515DIN25 pdf 514.5 55 3 25 6.1 Dielectric 200nm to 1150nm 5
532DIN12 pdf 532 60 3 12.5 6.1 Dielectric 200nm to 1150nm 5
532DIN25 pdf 532 60 3 25 6.1 Dielectric 200nm to 1150nm 5
546DIN25 pdf 546.1 60 3 25 6.1 Dielectric 200nm to 1150nm 5
578DIN25 pdf 577.7 60 3 25 6.1 Dielectric 200nm to 1150nm 5
589DIN12 pdf 589.6 60 3 12.5 6.1 Dielectric 200nm to 1150nm 5
589DIN25 pdf 589.6 60 3 25 6.1 Dielectric 200nm to 1150nm 5
633DIN12 pdf 632.8 60 3 12.5 6.1 Dielectric 200nm to 1150nm 5

9 Items


Narrowband Interference Bandpass Filters

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