Vacuum Optics Catalogue - March 2022

Attenuation Filter Wheels
Specification
Material:
Optical Density
Linearity:
Laser quailty quartz/ Spectrosil
Transmission >80% for
250nm to 2500nm
+/- 6% (with angle)
Coated Sector: 300°
Parallelism:
Surface Quality:
Coating:
Dimension
Tolerance:
+/- 20 arc sec
20-10 scratch/dig
PVD metallic alloy optimised for
spectral neutrality
< +/- 0.2mm
Attenuation
Filter Wheels
Torr Scientific manufactures Attenuation Filter Wheels in a range of sizes from 50 mm to 120 mm
diameter and with differing optical densities 0-1, 0-2 and 0-3. These filters are useful as beam splitters
and for applications requiring variable light attenuation in a continuous analogue mode, such
as in spectrophotometers and laser measuring systems. Laser quality fused silica is used for UV/VIS/
NIR applications and for its thermal stability. All filter wheels are manufactured to tight tolerances
especially parallelism to minimise beam movement with rotation. Specially designed items can also
be accommodated on request. Each filter wheel is supplied with a test certificate - typical data for a
non-standard density of 2.25 stays well within the specified linearity tolerance of +/- 6%.
Transmission Curve - Fused Silica
Please note that the optical transmission curves are approximations and should be used for reference only
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