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ALUMINUM:

Aluminum mirrors and variable density filters are available in standard and custom sizes on glass, plastic, and silicon wafers. The opacity or optical density of a film is a function of film thickness. Figure 1 presents film transmission and optical density as a function of film thickness. For films of sufficient thickness (greater than a few hundred angstroms), the reflection of recently deposited aluminum is essentially constant. Aluminum will oxidize over time and reflectivity will degrade. An overcoat of magnesium fluoride is available for protection of the aluminum film against oxidation. Figure 2 presents visible reflection in the visible for both freshly deposited aluminum and protected aluminum.

Mirrors, optical density filters, and variable density transmission filters are available on standard glass and plastic substrates. We also offer wafer aluminizing services.

Figure 1: The transmission through a thin aluminum film is a function of film thickness. We fabricate standard and custom filters with variable transmission and reflection. Applications include selective attenuation of laser sources or improved uniformity of light sources.

Figure 2: At sufficient thickness, the reflectivity of an aluminum mirror is essentially independent of further increases in film thickness, however, the mirror oxidizes over time. A protective overcoat can be added to extend the life of the mirror. Reflectivity of a protected aluminum film, relative to a freshly coated aluminum film, is plotted versus wavelength. A loss in visible reflectivity of about 3% can be expected.


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Rugate Technologies, INC. | 353 Christian Street | Oxford, CT 06478
203-267-3154 | e-mail: info@rugate.com | on the web: www.rugate.com