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Products: VUV/UV Wideband Filters

VUV/UV Wideband Filters image

Acton’s standard wideband optical filters are made from the highest-quality optical materials and are used in many research and industrial applications.

Filters are visually and optically inspected before they are shipped, and include individual transmittance curves to show each filter’s performance characteristics. Detailed “rejection” curves can be purchased at the time of manufacture. Other wavelengths and sizes are available, as are image-quality filters.
Feel free to contact us with details of your custom or OEM filter requirements at [email protected].



Wideband VUV/UV Optical Filters

Wavelength (nm)
Min. Peak
0.5” Diameter
2mm Thick
1.0” Diameter
2.5mm Thick
2.0” Diameter
4mm thick
130 +/-10nm 100 +/-25 40% FW130-W-.5D FW130-W-1D FW130-W-2D
160 +/-10nm 100 +/-25 45% FW160-W-.5D FW160-W-1D FW160-W-2D
200 +/-10nm 60 +/-20 45% FW200-W-.5D FW200-W-1D FW200-W-2D
250 +/-10nm 80 +/-20 45% FW250-W-.5D FW250-W-1D FW250-W-2D
300 +/-10nm 100 +/-25 45% FW300-W-.5D FW300-W-1D FW300-W-2D

NOTE: Filters are available for all wavelengths up to 320nm. Specifications for FWHM, peak
transmission and peak wavelength fall within peak wavelength ranges listed above.

UV Bandpass Filters


Available Designs for Standard Bandpass Filters

Open-Faced Design

Open-Faced - The open-faced design includes a substrate with an optical filter coating on one surface. Open-faced filters must be handled with care as the soft filter coating is exposed. Potential damage from moisture, atmospheric contaminants or handling can be reduced by sealing the
filter with a protective fused silica cover, as shown below (available above 190nm only).

Covered/Edge SealedCovered / Edge Sealed - Filters above 190nm may be supplied with a fused silica cover for protective purposes. As shown in the diagram, a spacer ring is placed between the substrates to form a small air gap, then the edges are sealed. This design enables the filter to be handled without risk of touching the delicate filter coating. Please note that covering a filter decreases its transmission by 2-3%.

Edge sealing adds approximately 0.010” (0.254mm) to the diameter of the filter. Total thickness for a covered and edge sealed filter is approximately twice that of an open-faced design. Exact dimensions are available from the Optics Sales Department.


Mounted - Cover design in mounting ringsMounted - Open-faced or covered filters (without edge sealant) can be supplied in metal mounting rings, if desired. The rings are constructed from aluminum and are black anodized. Mounting a filter reduces clear aperture and increases the outside diameter as outlined below.


Diameter Information for -N, -B, -W and -VBB Filters


NOTE: Filters are supplied open-faced unless otherwise specified
* 2.0“ Diameter 122-157nm filters are 5mm thick

Mounted Filter
Diameter ±0.005”
Mounted Thickness Clear
0.5” (12.7mm) +0.00”/-0.005” (0.127mm) 0.625” (15.88mm) 0.079" (2mm) 0.300” (7.62mm) 0.450” (11.43mm)
1.0” (25.4mm) +0.00”/-0.005” (0.127mm) 1.200” (30.48mm) 0.098" (2.5mm) 0.375” (9.53mm) 0.800” (20.32mm)
2.0” (50.8mm) +0.00”/-0.005” (0.127mm) 2.225” (56.52mm) 0.197" (4mm) 0.500” (12.7mm) 1.900” (48.26mm)


Filter Material Information


Wavelengths < 140nm 140-169nm 170-320nm
Substrate Material VUV MgF2 VUV CaF2 UV Grade Fused Silica



Typical sample performance curves shown. Specific design curves including blocking performance available upon request.

Wideband filter