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| Absorbing Neutral Density Filters |
Neutral Density Filters
Control Optics' neutral density filters are made by vacuum deposition of a thin film of several special metallic alloys on a substrate of fine polished BK7 glass. We also carry regular grey colored glass absorption filters. The density of these filters is defined as D = log 1/T, where T is the transmittance of the filter. The density of these filters is constant over a wide spectral region. Therefore, thy can be employed for broadband light beam attenuation and detector calibration.
* Custom sizes and shapes can be provided upon request
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