NEWPORT FRQ-ND20 UV FUSED SILICA METALLIC FILTER

The FRQ-ND20 UV Fused Silica Metallic Neutral Density Filter is a 25.4 mm diameter UV Fused Silica Metallic ND Filter with an optical density of 2.0 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.

This unit has the following features:

• Model: FRQ-ND20
• Type: UV Fused Silica Metallic ND Filter
• Diameter: 1 in. (25.4 mm)
• Optical Density: 2.0
• Surface Flatness: <=1? at 632.8 nm over the clear aperture
• Surface Quality: 60-40 scratch-dig
• Material: UV grade fused silica
• Thickness: 3.0 mm
• Chamfers: 0.25 - 0.76 mm face width
• Chamfers Angle/Tolerance: 45° ±15°
• Diameter Tolerance: ±0.25 mm
• Optical Density Tolerance: <=OD <=4.0
• Thickness Tolerance: ±0.25 mm
• Clear Aperture: >=central 80% of dimensions
• Damage Threshold: 30 W/cm2 CW, typical; not recommended for pulsed laser use
• Transmission at 632.8 nm: 1.0 %
• Wedge: <=3 arc min
• Angle of Incidence: 0°
• Cleaning: Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended