Available empty or with Pre-loaded ND Filters
Wide range of optical densities possible
More accurate than variable ND filters
Easy filter exchange & fast indexed positioning
Universal mounting
Our ND filter wheels are available in a 6-position single wheel version or a 12 position dual wheel version. They can be ordered with or without the ND filters.
Our single ND filter wheels can be ordered empty or with two different sets of ND filters installed. Our dual ND filter wheel can also be ordered empty or with filters pre-installed.
With our single ND filter wheels you can choose one of the 6 optical densities pre-installed. The simple two-wheel design of our model 5215 can provide optical densities from 0.08 to 3.0 in 0.1 increments by aligning the filters in the two wheels.
These filter wheels are less expensive than circular variable attenuators and offer greater precision. Since each wheel contains discrete filters, you know the exact optical density and can accurately measure laser powers over a large dynamic range. Unlike other neutral-density filter sets, our filters are all in a single handy mount. You won’t have to deal with clunky filter holders, missing filters, or fingerprints any more.
Our pre-populated wheels includes six 1.0 inch diameter filters made with Inconel metallic coatings on glass substrates. The filter positions are mechanically indexed for precise positioning. We mount the filters at a slight angle to reduce étalon effects, although there will be some residual étalon effects for beam diameters greater than a few millimeters.
All our ND-filter wheels have an 8-32 (M4) clearance hole so they can mount directly to a post or pedestal riser using imperial or metric threads.
| Optical Density Values | ||||||
|---|---|---|---|---|---|---|
| Primary Wheel | 0.03 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| Secondary Wheel | 0.03 | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
Optical Density values are additive. Use of two filter wheels or two filters in a single filter slot produces a wide range of optical densities. For example, to achieve an optical density value of 1.7, select a filter with a density of 1.5 and 0.2.