Products: VUV/UV Wideband Filters

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

Peak Wavelength (nm)	FWHM (nm)	Min. Peak Transmission	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 - 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 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 - 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

Unmounted Filter Diameter	Diameter Tolerance	Mounted Filter Diameter ±0.005”	Unmounted Filter Thickness	Mounted Thickness	Clear Aperture
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)