Circular Variable Neutral Density Filter
Circular variable neutral density filters, also called circular variable density filters, linearly attenuate light intensity by rotating the filter. They provide precise light-energy adjustment along the circular linear direction, making the light energy adjustable and controllable while maintaining a neutral spectral energy distribution. These filters can be used with natural light, lasers, and other applications. Combining 2 filters and rotating them in opposite directions produces fixed-density attenuation over a relatively large finite area. Product sizes from 25mm to 100mm are available, with a spectral range of 250nm—2500nm. Special sizes, densities, and wavelengths can be customized.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Substrate | K9, fused silica |
| Outer Diameter | 20mm-200mm |
| Inner Diameter | 7.5mm、8.0mm、8.3mm |
| Standard Deviation at the Deepest Optical Density Point | ±5% |
| Standard Linearity | ±5% |
| Surface Quality | 80-50 |
| Coating Area | 0°-270° |
| Calibrated Wavelength | 550nm |
| Design Wavelength | 380nm-2000nm (BK7)/ 250nm-2500nm (fused silica) |
| Relative Density Range | 0-1.0，0-1.5，0-2.，0-3. |
Datasheet
Supplier Information
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