Flat / Right-Angle Mirror
Mirrors steer beams and serve interferometry, imaging, and illumination. Polished glass or metal substrates control light through specular reflection. Reflective coatings improve efficiency: Metal coatings commonly use aluminum, silver, or gold. Aluminum reflects well from UV to IR and forms a stable adherent alumina surface layer. Silver offers excellent visible/IR reflectance with weak polarization effects from incidence-angle changes. Gold has high IR reflectance and greater strength and stability than silver. Soft metal films scratch easily, so protective coatings are usually added. They are relatively insensitive to incidence angle and usable over broad wavelengths for most optical instruments. Multilayer dielectric coatings provide higher reflectance and lower absorption. Their efficiency depends on angle and wavelength, so the applicable incidence angle (0° or 45°) and operating band are normally specified.
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