The 50Q04AV.2 is a circular variable metallic neutral density filter, made of UV grade fused silica, 127 mm in diameter, surface flatness of ≤1λ/2, and coated for an OD range of 0.05-2.0.
Our circular variable neutral density filters are designed to simplify attenuation and beamsplitting in the visible to NIR. The variable attenuation and beamsplitting around a 270° circle is achieved by a thin, reflective aluminum film. A broadband, visible AR coating on the back side allows the filter to be left in the beam path at all times with minimal losses or ghost images. Circular variable ND filters are available with BK 7 substrates for general laboratory use, or UV fused silica substrates for maximum thermal stability.
| Model | 50Q04AV.2 |
|---|---|
| Type | Circular Linear Variable ND Filters |
| Diameter | 5.0 in. (127.0 mm) |
| Thickness | 0.38 in. |
| Material | UV grade fused silica |
| Surface Quality | 30-10 scratch-dig |
| Surface Flatness | ≤λ/2 |
| Optical Density | 0.05-2.0 |
| Diameter Tolerance | +0/-0.25 mm |
| Thickness Tolerance | ±0.38 mm |
| Clear Aperture | From 33 mm to 101 mm diameter |
| Damage Threshold | 75 W/cm2 CW, 10 mJ/cm2 with 10 nsec pulses at the specified wavelength, typical |
| Optical Density Tolerance | ±0.20 over 270° at 0° AOI, density increases in a counterclockwise direction |
| Inside Diameter | 25.4 mm |
| Chamfers | 0.50–1.52 mm face width |
| Chamfers Angle/Tolerance | 45° ±15° |
| Cleaning | Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended |
