Astro optics pvt. Ltd. An iso 9001 : 2000 certified company manufactures various types of optical components and reflective coatings are high reflection or partial reflection coatings. These can be either metal coated or dielectric coated. Metal coatings are of aluminum / silver / gold on the polished glass surface increases the reflection and are useful for many applications.
Aluminum coated mirrors are very stable and most commonly used since aluminum gives reflection right from uv to ir region. Aluminum mirrors to be used in the visible region are usually protected with a layer of silicon monoxide for durability.
Silver has the highest reflection in the visible region but is more expensive due to the difficulties involved in the coating process. The coatings are not as stable as aluminum.
Gold coatings can be used for reflection in ir region.
