Antireflection Coating AR) • High-Reflection Coating (HR)
When light enters a medium with different optical properties, most notably refractive index, part is reflected and part transmitted. The reflected-to-refracted intensity ratio mainly depends on the refractive index difference, incident polarization, and incidence angle. Each surface of an uncoated glass substrate reflects approximately 4%, leaving total transmission at only 92%. Coating each component increases system throughput and reduces harm from backward reflections and ghost images. Optical coatings modify reflection, transmission, absorption, or polarization. The coated component is generally called a substrate. Coatings are deposited in high vacuum by electron-beam evaporation or ion-assisted deposition (IAD). Materials include metals such as gold, aluminum, silver, and chromium, and semiconductors such as silicon and germanium.
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