The FRQ-ND03 UV Fused Silica Metallic Neutral Density Filter is a 25.4 mm diameter UV Fused Silica Metallic ND Filter with an optical density of 0.3 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.
| Model | FRQ-ND03 |
|---|---|
| Type | UV Fused Silica Metallic ND Filter |
| Diameter | 1.0 in. (25.4 mm) |
| Thickness | 0.118 in. |
| Material | UV grade fused silica |
| Surface Quality | 60-40 scratch-dig |
| Surface Flatness | ≤1λ at 632.8 nm over the clear aperture |
| Optical Density | 0.3 |
| Wedge | ≤3 arc min |
| Diameter Tolerance | ±0.25 mm |
| Thickness Tolerance | ±0.25 mm |
| Clear Aperture | ≥central 80% of dimensions |
| Damage Threshold | 30 W/cm2 CW, typical; not recommended for pulsed laser use |
| Angle of Incidence | 0° |
| Transmission | 50.1 % at 632.8 nm |
| Optical Density Tolerance | ±6% |
| Chamfers | 0.25–0.76 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
