Metallic ND Filter, UV Fused Silica, 50.8x50.8 mm, 1.5 OD at 632.8 nm
The FSQ-ND15 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 1.5 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
Size
50.8 x 50.8 mm
Wavelength Range
350 - 2000 nm
Optical Density
1.5
Optical Density Tolerance
±4% @ 632.8 nm
Transmission
3.2% @ 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
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
Size
50.8 x 50.8 mm
Wavelength Range
350 - 2000 nm
Optical Density
1.5
Optical Density Tolerance
±4% @ 632.8 nm
Transmission
3.2% @ 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
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
