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Metallic ND Filter, UV Fused Silica, 50.8x50.8 mm, 4.0 OD at 632.8 nm

Metallic ND Filter, UV Fused Silica, 50.8x50.8 mm, 4.0 OD at 632.8 nm

Model: FSQ-ND40

$165.00

In Stock

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Product Series Overview

UV Fused Silica Metallic ND Filters

The FSQ-ND40 UV Fused Silica Metallic Neutral Density Filter is a 50.8 x 50.8 mm square UV fused silica metallic ND filter with an optical density of 4.0 at 632.8 nm. 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 near-infrared. All filters are permanently marked with the optical density.

Specifications

Technical Specs

Size

50.8 x 50.8 mm
Wavelength Range

350 - 2000 nm
Optical Density

4
Optical Density Tolerance

±4% @ 632.8 nm
Transmission

0.01% @ 632.8 nm
Angle of Incidence

0°
Material

UV grade fused silica or equivalent
Damage Threshold

30 W/cm² CW, typical; not recommended for pulsed laser use
Thickness

3.0 mm
Thickness Tolerance

±0.25 mm

Surface Flatness

≤2λ at 632.8 nm over the clear aperture
Surface Quality

60-40 scratch-dig
Clear Aperture

≥central 80% of dimensions
Wedge

≤3 arc min
Chamfers

0.25–0.76 mm face width
Chamfers Angle Tolerance

45° ±15°
Durability

MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
Cleaning

See How to Clean Optics

Size

50.8 x 50.8 mm
Wavelength Range

350 - 2000 nm
Optical Density

4
Optical Density Tolerance

±4% @ 632.8 nm
Transmission

0.01% @ 632.8 nm
Angle of Incidence

0°
Material

UV grade fused silica or equivalent
Damage Threshold

30 W/cm² CW, typical; not recommended for pulsed laser use
Thickness

3.0 mm
Thickness Tolerance

±0.25 mm

Surface Flatness

≤2λ at 632.8 nm over the clear aperture
Surface Quality

60-40 scratch-dig
Clear Aperture

≥central 80% of dimensions
Wedge

≤3 arc min
Chamfers

0.25–0.76 mm face width
Chamfers Angle Tolerance

45° ±15°
Durability

MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
Cleaning

See How to Clean Optics

Resources & Downloads

2D / 3D CAD Software

Download CAD Files

Drawings And Cad

COLOREDG-S (61 kB, PDF)

Other

FSQ-ND40 RoHS Certificate (265 kB, PDF)
FSQ-ND40_ROHS2-2021.pdf (279.4 kB, PDF)

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