Compare Model Drawings, CAD & Specs Size Optical Density Optical Density Tolerance Wavelength Range Material Availability Price
$41
In Stock
Ø25.4 mm 0.03 ±2.5% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 0.1 ±8% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 0.2 ±7% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 0.3 ±6% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 0.4 ±5% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 0.5 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$71
In Stock
Ø25.4 mm 0.6 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$71
In Stock
Ø25.4 mm 0.7 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$71
In Stock
Ø25.4 mm 0.8 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$71
In Stock
Ø25.4 mm 0.9 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 1 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 1.5 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 2 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 2.5 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$68
In Stock
Ø25.4 mm 3 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$71
In Stock
Ø25.4 mm 4 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$127
In Stock
50.8 x 50.8 mm 0.03 ±2.5% 350 - 2000 nm UV grade fused silica
In Stock
$137
In Stock
50.8 x 50.8 mm 0.1 ±8% 350 - 2000 nm UV grade fused silica
In Stock
$144
In Stock
50.8 x 50.8 mm 0.2 ±7% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.3 ±6% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.4 ±5% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.5 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.6 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.7 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.8 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 0.9 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 1 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$150
In Stock
50.8 x 50.8 mm 1.5 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$157
In Stock
50.8 x 50.8 mm 2 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$157
In Stock
50.8 x 50.8 mm 2.5 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$157
In Stock
50.8 x 50.8 mm 3 ±4% 350 - 2000 nm UV grade fused silica
In Stock
$157
In Stock
50.8 x 50.8 mm 4 ±4% 350 - 2000 nm UV grade fused silica
In Stock

Features

Finely Control Beam Attenuation

These filters are available individually or in a set of eight. The set consists of a logical assortment of filters packaged in a protective hardwood case. All filters are permanently marked with the optical density and are shipped with a transmission curve. Filters from this product family may be used individually, or combined in series, to obtain any desired density from 0 to 7 in steps of 0.1 OD.

Metallic Coating Properties

Due to the absorptive nature of the metallic coating, use with high-power lasers should be avoided. Power levels less than 30 W/cm2 are advised.

For additional attenuators, see Laser Beam Attenuators

Additive Optical Densities

Optical density (OD) is given by the relationship: OD = -log(T) or T = 10(-OD) where T is transmittance (0≤T≤1). Optical Density, unlike transmittance, is additive. When multiple filters are stacked, the total density is easily found by adding up the densities of each filter in the series. For example to achieve desired transmittance of 8%, first calculate the equivalent density (OD = -log(0.08) = 1.097 ≅ 1.1), then find a combination of filters that adds to the desired number, such as a combination of an OD1 filter and an OD0.1 filter.

UV Fused Silica Substrate

The coating is deposited on one side of an ultra-pure UV grade fused silica substrate providing excellent transmission from the ultraviolet to the near-infrared (350-2000nm). These precision polished substrates have flatness less than 1λ–2λ, resulting in low wavefront distortion for the transmitted beam. The polished second surface is uncoated.

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.