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1800nm Standard Interference Bandpass Filter 12.5mmdia x 16nmBW

Only 6 left in stock
SKU: 1800DIB12
More Information
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Diameter (mm) 12.5
Thickness (mm) 6.1
Avg. Blocking OD 4
Avg. Blocking Range 200nm to 2150nm
Blocking Type Dielectric
CWL(nm) 1800
Mounted/Unmounted Mounted
Peak Transmission (%) 40

These interference band-pass filters are used to isolate and transmit a specified narrow wavelength and reflect all other incident wavelengths.

Knight Optical's stock range of high quality standard bandwidth visible type interference filters is available from 330nm-2000nm in various bandwidths to meet most requirements, such as imaging and instrumentation. This visible range has a standard 45-50% transmission however some common wavelengths are stocked with a high 70% transmission (See FIJ type filters).

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.

For more information on our stock range of interference bandpass 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)
<0.01% (OD4) see individial specifications for range for filters with CWL 1660nm and upwards.
± 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