Compare Model Drawings, CAD & Specs Size Optical Density Wavelength Range Material Availability Price
$444
In Stock
Ø100.0 mm 0 - 1 250-2500 nm UV grade fused silica
In Stock
$444
In Stock
Ø100.0 mm 0 - 2 250-2500 nm UV grade fused silica
In Stock
$474
In Stock
Ø100.0 mm 0 - 4 250-2500 nm UV grade fused silica
In Stock
$262
In Stock
Ø25.0 mm 0 - 1 250-2500 nm UV grade fused silica
In Stock
$262
In Stock
Ø25.0 mm 0 - 2 250-2500 nm UV grade fused silica
In Stock
$282
In Stock
Ø25.0 mm 0 - 4 250-2500 nm UV grade fused silica
In Stock
$359
In Stock
Ø50.0 mm 0 - 1 250-2500 nm UV grade fused silica
In Stock
$359
In Stock
Ø50.0 mm 0 - 2 250-2500 nm UV grade fused silica
In Stock
$379
In Stock
Ø50.0 mm 0 - 4 250-2500 nm UV grade fused silica
In Stock

Features

Finely Control Beam Attenuation

These variable neutral density filters allow convenient adjustment of beam attenuation by simply rotating the filter. Optical density varies linearly with rotation angle across a 270° range from 0 up to the chosen maximum of OD1, OD2, or OD4. An arbitrary transmitted beam power may then be obtained easily using the angular markings to rotating the variable ND filter to the specific corresponding angle. Due to this linearity in density, the rotation may even be motorized to produce a precise logarithmic sweep in the transmitted beam power.

Filter Mounting

We offer a variety of rotary mounts for the variable neutral density filter. Please check out the accessories section below for recommendations. Shown is model FR-CV-75 compact circular variable ND filter mount.

Model FR-CV-75 Circular Variable Neutral Density Filter/Beamsplitter Mount.

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.

AR Coated Second Surface

The second surface of this circular linear variable filter is AR coated to prevent undesired transmission loss, and to reduce stray light due to back reflections. The AR coating is optimized for 440 to 700 nm.

Wide Wavelength Range

Fused silica substrate for these ND filters allows the transparency from 250-2500 nm range.