Compare Model Drawings, CAD & Specs Size Optical Density Optical Density Tolerance Material Availability Price
$2,019
In Stock
Ø127.0 mm 0.05 - 1 ±0.15 over 270° at 0° AOI N-BK7
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$2,322
In Stock
Ø127.0 mm 0.05 - 2 ±0.15 over 270° at 0° AOI UV Grade Fused Silica
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Features

Finely Control Beam Attenuation

These filters allow convenient adjustment of beam attenuation by simply rotating the filter. Optical density varies continuously from 0.05–1.0 (or 0.05-2.0) across a 270° angular range. The thin reflective aluminum film is able to withstand moderate power laser beams. BK7 substrates are a good general laboratory use option, while Fused Silica substrates offer maximum thermal stability.

Optimized for 450-700 nm Wavelength Range

Circular variable ND filters are available with BK 7 substrates for general laboratory use, or UV fused silica substrates for maximum thermal stability. Although the coatings are optimized for 450–700 nm, they will operate from 400–1100 nm with only minor losses.

Circular ND Filter Mounting

Our circular variable attenuators are ideally mounted with our 941 and 946 mounts.

946 Circular Variable Neutral Density Filter Mount.

Variable Beamsplitter Applications

These filters consist of a thin metallic coating of variable thickness. Because attenuation is primarily caused by reflection with only a small amount of absorption, these filters may optionally be used as variable beamsplitters.

Proper Orientation

To prevent unwanted interference from etalon effects, filters should be angled slightly with respect to the incident beam. To minimize back reflections, the filter should be oriented with the coated metallic surface facing the incident beam. Any light reflected from the uncoated second surface will pass through the metallic coating first, which will greatly attenuate unwanted back reflections.