DescriptionSpecifications
Models
Catalog PDF
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Our metallic neutral density coatings provide broadband attenuation for lower power applications. The coating is deposited on one side of a cost effective B 270 optical glass substrate, providing excellent performance in the visible and near-infrared. The second polished side is uncoated.
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 shipped with a transmission curve.
Our unique assortment of filters permits easy selection of any desired density from 0–6 with 0.1 OD resolution by using individual or combinations of filters. Optical density (OD) is defined by the relationship:
OD = -log(T) or T = 10-OD,
where T is transmission (0≤T≤1). The density of a series of filters, unlike transmission, is additive. Custom densities can therefore be obtained by stacking filters, however stacking an excessive number of filters can lead to numerous unwanted back reflections.
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 attenuation of high-energy lasers our Model 935 variable attenuator is recommended (see High-Energy Variable Attenuators). |
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Specifications
| Material | B 270 optical crown glass |
| Surface Flatness | ≤5λ at 632.8 nm over the clear aperture |
| Clear Aperture | ≥central 80% of dimensions |
| Surface Quality | 60-40 scratch-dig |
| Dimensions | mm |
| Thickness | 3.0 ±0.25 mm |
| Wedge | ≤5 arc min |
| Chamfers | 0.25–0.76 mm face width x 45° ±15° |
| Angle of Incidence | 0° |
| Optical Density at 632.8 nm | 0.04 ±2.5%, 0.1 ±8%, 0.2 ±7%, 0.3 ±6%, 0.4 ±5%, and ±4% at 0.5≤OD≤3.0 |
| Durability | MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol
on lens tissue recommended (Unknown type Newport.Step.Product.XRefElement) |
| Damage Threshold | 30 W/cm2 CW, typical; not recommended for pulsed laser use |
Note: 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.
| | Model | Description |
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FB-ND
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Optical Crown Glass Metallic ND Filter Set, 25.4 mm Diameter, Inc: (8) Filters
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FBR-ND004
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.04 OD at 632.8 nm
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FBR-ND01
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.1 OD at 632.8 nm
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FBR-ND02
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.2 OD at 632.8 nm
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FBR-ND03
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.3 OD at 632.8 nm
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FBR-ND04
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.4 OD at 632.8 nm
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FBR-ND05
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.5 OD at 632.8 nm
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FBR-ND10
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 1.0 OD at 632.8 nm
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FBR-ND15
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 1.5 OD at 632.8 nm
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FBR-ND20
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 2.0 OD at 632.8 nm
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FBR-ND25
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 2.5 OD at 632.8 nm
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FBR-ND30
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Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 3.0 OD at 632.8 nm
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FBS-ND004
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.04 OD at 632.8 nm
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FBS-ND01
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.1 OD at 632.8 nm
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FBS-ND02
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.2 OD at 632.8 nm
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FBS-ND03
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.3 OD at 632.8 nm
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FBS-ND04
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.4 OD at 632.8 nm
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FBS-ND05
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.5 OD at 632.8 nm
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FBS-ND10
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 1.0 OD at 632.8 nm
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FBS-ND15
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 1.5 OD at 632.8 nm
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FBS-ND20
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 2.0 OD at 632.8 nm
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FBS-ND25
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 2.5 OD at 632.8 nm
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FBS-ND30
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Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 3.0 OD at 632.8 nm
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