With their ability to minimize back-reflections and scattered light, absorptive neutral density (ND) filters are ideal for calibration. In contrast to the metallic type, absorption-type filters achieve their optical density by absorbing light within the substrate. For this reason, thickness is a key determinant of opacity. Because of their absorbing quality, these filters are suitable for low-power applications only.
Andover's absorbing ND filters are unique in that they are AR coated to reduce surface reflections. Polished to TWF 1/4 wave or better, this enables them to be stacked without concern about losses and artifacts due to multiple reflections. Absorbing ND filters are perfect for imaging applications.
Please note that all of our Absorbing ND filters are also available in sets, which include a hardwood storage box.
BENEFITS
- Ability to minimize back reflections and scattered light
- Suitable for low power applications
COMMON APPLICATIONS
- Photomicrography
- Machine vision
- Calibration
- Photography
- Scientific Measurements and research
GENERAL SPECIFICATIONS
| Thickness: | 5.0mm (maximum) |
| Dimensional Tolerance: | +0.0/-0.25mm |
| Clear Aperture: | 90% of outside dimension |
| Surface Quality: | 80/50 per MIL-0-13830B |
| Max. Operating Temperature: | +100°C |
| Substrate Material: | Schott absorption glass |
| Spectral Range: | 450–700nm |
| Optical Quality: | TWF of λ/4 per inch and parallelism of 30 arc seconds or better |
| Mechanical: | Unmounted |
DESCRIPTION
With their ability to minimize back-reflections and scattered light, absorptive neutral density (ND) filters are ideal for calibration. In contrast to the metallic type, absorption-type filters achieve their optical density by absorbing light within the substrate. For this reason, thickness is a key determinant of opacity. Because of their absorbing quality, these filters are suitable for low-power applications only.
Andover's absorbing ND filters are unique in that they are AR coated to reduce surface reflections. Polished to TWF 1/4 wave or better, this enables them to be stacked without concern about losses and artifacts due to multiple reflections. Absorbing ND filters are perfect for imaging applications.
Please note that all of our Absorbing ND filters are also available in sets, which include a hardwood storage box.
BENEFITS
- Ability to minimize back reflections and scattered light
- Suitable for low power applications
COMMON APPLICATIONS
- Photomicrography
- Machine vision
- Calibration
- Photography
- Scientific Measurements and research
GENERAL SPECIFICATIONS
| Thickness: | 5.0mm (maximum) |
| Dimensional Tolerance: | +0.0/-0.25mm |
| Clear Aperture: | 90% of outside dimension |
| Surface Quality: | 80/50 per MIL-0-13830B |
| Max. Operating Temperature: | +100°C |
| Substrate Material: | Schott absorption glass |
| Spectral Range: | 450–700nm |
| Optical Quality: | TWF of λ/4 per inch and parallelism of 30 arc seconds or better |
| Mechanical: | Unmounted |
DESCRIPTION