A thin metal layer is deposited under high vacuum on a substrate of optically polished glass or quartz in such a way that part of the incident light is transmitted, part is reflected and the rest is absorbed by the metal layer.
By specific modification of the evaporation parameters, ND-filters with different transmission values are created.
The ND- filters are classified on the basis of the transmission or the optical density of the filter.
Data sheet standard
Data sheet OEM
- High thermal load capacity
- Dense layers, tropicalized
- Extremely long service life