Metallic ND Filter, UV Fused Silica, 25.4 mm, 2.5 OD at 632.8 nm
Metallic ND Filter, UV Fused Silica, 25.4 mm, 2.5 OD at 632.8 nm
Model: FRQ-ND25
Product Series Overview
UV Fused Silica Metallic ND FiltersThe FRQ-ND25 UV Fused Silica Metallic Neutral Density Filter is a 25.4 mm diameter UV Fused Silica Metallic ND Filter with an optical density of 2.5 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
- SizeØ25.4 mm
- Wavelength Range350 - 2000 nm
- Optical Density2.5
- Optical Density Tolerance±4% @ 632.8 nm
- Transmission0.3% @ 632.8 nm
- Angle of Incidence0°
- MaterialUV grade fused silica or equivalent
- Damage Threshold30 W/cm2 CW, typical; not recommended for pulsed laser use
- Size Tolerance±0.25 mm
- Thickness3.0 mm
- Thickness Tolerance±0.25 mm
- Surface Flatness≤1λ at 632.8 nm over the clear aperture
- Surface Quality60-40 scratch-dig
- Clear Aperture≥central 80% of dimensions
- Wedge≤3 arc min
- Chamfers0.25–0.76 mm face width
- Chamfers Angle Tolerance45° ±15°
- DurabilityMIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
- Cleaning
Resources & Downloads
2D Product Drawings
FBR-NDXX-S(62 kB, PDF)
Other
FRQ-ND25 RoHS Certificate(264.7 kB, PDF) FRQ-ND25_ROHS2-2021.pdf(280.5 kB, PDF)
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