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

These high quality ultra-violet interference bandpass filters are available from 214nm-320nm in various bandwidths to meet a range of UV instrument requirements such as fluorescence imaging and instrumentation. This range of UV bandpass filter has high transmission at very competitive costs.

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.

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; ASCII files are available on request. 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):

CWL Tolerance (nm):
HBW Tolerance (nm):
Optimum Operating temperature:
Edge Treatment:
Edge Marking Format:
Surface Quality:
Usable Temperature Limits:
Design Type:
12.5mm ± 0.1 (8.5mm aperture)
25.0mm ± 0.1 (21mm aperture)
50.0mm ± 0.1 (46mm aperture)
<=6.1mm +0/-0.1
<0.01% (OD4) @ 200nm to 3000nm (for filters with CWL 1600nm upwards)
<0.01% (OD4) @ 200nm to 2000nm (for all other filters)
± 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) Mounted/Unmounted Blocking Type Avg. Blocking Range Avg. Blocking OD Price Buy
320FIB25 pdf 320 25 10 25 6.1 Mounted Silver 200nm to 1150nm 4
320FIB12 pdf 320 30 10 12.5 6.1 Mounted Silver 200nm to 1150nm 4
310FIB25 pdf 310 20 10 25 6.1 Mounted Silver 200nm to 1150nm 4
300FIB25 pdf 300 25 14 25 6.1 Mounted Silver 200nm to 1150nm 4
280FIB12 pdf 280 17 10 12.5 6.1 Mounted Silver 200nm to 1150nm 4
254FIB12 pdf 254.7 17 10 12.5 6.1 Mounted Silver 200nm to 1150nm 4
220FIB12 pdf 220 16 10 12.5 6.1 Mounted Silver 200nm to 1150nm 4
214FIB25 pdf 214 14 10 25 6.1 Mounted Silver 200nm to 1150nm 4
214FIB12 pdf 214 14 10 12.5 6.1 Mounted Silver 200nm to 1150nm 4

9 Items


UV Interference Bandpass Filters

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