Newport Corporation | UV Fused Silica Metallic Neutral Density Filters

UV Fused Silica Metallic Neutral Density Filters

Broadband attenuation, UV to near IR
Metallic neutral density coating
Low wavefront distortion
UV grade fused silica
For lower power applications

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DescriptionSpecifications Models Catalog PDF

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 ultraviolet to the near-infrared. These precision polished substrates have flatness less than 1λ–2λ. 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 permanently marked with the optical density and are shipped with a transmission curve.

Our unique assortment of filters permits easy selection of any desired density, from 0–8 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).

Specifications

Material	UV grade fused silica
Surface Flatness	25.4 mm Round: ≤1λ at 632.8 nm over the clear aperture 50.8 mm Square: ≤2λ at 632.8 nm over the clear aperture
Clear Aperture	≥central 80% of dimensions
Surface Quality	60-40 scratch-dig
Dimensions	±0.25 mm
Thickness	3.0 ±0.25 mm
Wedge	≤3 arc min
Chamfers	0.25–0.76 mm face width x 45° ±15°
Angle of Incidence	0°
Optical Density at 632.8 nm	0.03 ±2.5%, 0.1 ±8%, 0.2 ±7%, 0.3 ±6%, 0.4 ±5% and ±4% at 0.5 ≤OD ≤4.0
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

	Model	Description
	FR-ND	UV Fused Silica Metallic ND Filter Set, 25.4 mm Diameter, Includes 8 Filters
	FRQ-ND003	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.03 OD at 632.8 nm
	FRQ-ND01	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.1 OD at 632.8 nm
	FRQ-ND02	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.2 OD at 632.8 nm
	FRQ-ND03	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.3 OD at 632.8 nm
	FRQ-ND04	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.4 OD at 632.8 nm
	FRQ-ND05	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.5 OD at 632.8 nm
	FRQ-ND06	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.6 OD at 632.8 nm
	FRQ-ND07	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.7 OD at 632.8 nm
	FRQ-ND08	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.8 OD at 632.8 nm
	FRQ-ND09	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.9 OD at 632.8 nm
	FRQ-ND10	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 1.0 OD at 632.8 nm
	FRQ-ND15	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 1.5 OD at 632.8 nm
	FRQ-ND20	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 2.0 OD at 632.8 nm
	FRQ-ND25	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 2.5 OD at 632.8 nm
	FRQ-ND30	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 3.0 OD at 632.8 nm
	FRQ-ND40	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 4.0 OD at 632.8 nm
	FS-ND	UV Fused Silica Metallic ND Filter Set, 50.8 x 50.8 mm, Includes 8 Filters
	FSQ-ND003	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.03 OD at 632.8 nm
	FSQ-ND01	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.1 OD at 632.8 nm
	FSQ-ND02	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.2 OD at 632.8 nm
	FSQ-ND03	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.3 OD at 632.8 nm
	FSQ-ND04	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.4 OD at 632.8 nm
	FSQ-ND05	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.5 OD at 632.8 nm
	FSQ-ND06	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.6 OD at 632.8 nm
	FSQ-ND07	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.7 OD at 632.8 nm
	FSQ-ND08	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.8 OD at 632.8 nm
	FSQ-ND09	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.9 OD at 632.8 nm
	FSQ-ND10	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 1.0 OD at 632.8 nm
	FSQ-ND15	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 1.5 OD at 632.8 nm
	FSQ-ND20	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 2.0 OD at 632.8 nm
	FSQ-ND25	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 2.5 OD at 632.8 nm
	FSQ-ND30	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 3.0 OD at 632.8 nm
	FSQ-ND40	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 4.0 OD at 632.8 nm

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