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

Specifications

  • Wavelength Range
    350 - 2000 nm
  • Angle of Incidence
  • Wedge
    ≤3 arc min
  • Durability
    MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
  • Surface Quality
    60-40 scratch-dig
  • Chamfers
    0.25–0.76 mm face width
  • Chamfers Angle Tolerance
    45° ±15°
  • Cleaning
  • Clear Aperture
    ≥central 80% of dimensions
  • Damage Threshold
    30 W/cm2 CW, typical; not recommended for pulsed laser use
  • Thickness
    3.0 mm
  • Thickness Tolerance
    ±0.25 mm

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.

Neutral Density Filter Kits

The FR-ND UV Fused Silica Metallic Neutral Density Filter Set includes eight, 25.4 mm diameter, UV Fused Silica Metallic ND Filters. The FS-ND UV Fused Silica Metallic Neutral Density Filter Set includes eight, 50.8 x 50.8 mm square, UV Fused Silica Metallic ND Filters. Each kit includes optical densities of 0.03, 0.1, 0.3, 0.5, 1.0, 2.0 and 3.0. Our metallic neutral density coatings provide broadband attenuation for lower power applications. The coating is deposited on one side of an ultra-pure UV grade fused silica substrate providing excellent transmission from the UV to NIR. Filter kits provide convenience and cost savings.