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Broadband Range (22-45nm Bandwidth)

Our interference band-pass filters effectively isolate and transmit a specified narrow wavelength and reflect all other incident wavelengths.
Our standard stock range of high quality filters are available from 245nm-2000nm in various bandwidths to meet most requirements. Typically, our filters are 3-7 cavity and in most cases blocking is metal dielectric from 200nm to FIR (3000+nm) at OD4. The filters listed within this section are of the broadband range of 22-45nm bandwidth.
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 are mounted, un-mounted types with aerospace painted edges can be supplied at request.

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