Оптическое зеркало

Серебряное (Ag) зеркало

Name: Серебряное (Ag) зеркало
Rating: 4.5 (100 reviews)

Серебряное зеркало — это тип зеркала, получаемый путем нанесения слоя чистого серебра на поверхность оптической подложки (обычно стекла) химическими или физическими методами, а затем покрытия ее защитным слоем. Несмотря на склонность к окислению, серебряные зеркала остаются предпочтительным выбором в некоторых областях благодаря своей непревзойденно высокой отражательной способности.

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Основные характеристики

Structure

-Substrate: Usually optical glass (such as K9, fused silica, etc.), requiring a high surface finish and no defects. -Underlayer: Sometimes a layer of other metal (such as copper) is deposited first as a bonding layer to enhance the adhesion between the silver layer and the glass. -Silver Layer: The core functional layer, formed through physical vapor deposition (PVD).
Physical Vapor Deposition

Silver is heated and evaporated or sputtered onto the substrate in a high vacuum environment. This method can obtain a purer, denser, and higher-performance silver film for use in high-end optics.
Protective Layer

To overcome the problem of silver's easy oxidation, one or more protective films must be covered on top of the silver layer. Dielectric Protective Film: In the optical field, a transparent, chemically stable dielectric thin film, such as SiO₂ (silicon dioxide) or Al₂O₃ (alumina), is deposited. These films can effectively block moisture and corrosive gases, extending the life of the lenses.
Advantages

1. Highest reflectivity in the visible light range. 2. Extremely high reflectivity in the near-infrared band, superior to aluminum. 3. For the same reflectivity, silver mirrors can be made simpler (fewer layers) than dielectric film mirrors.

Спектральная кривая

Типичные области применения

High-end Optical Instruments

Such as high-precision interferometers, spectrometers, and research-grade telescopes, where extremely high light throughput is required.
Laser Optics

Particularly for laser resonator mirrors and reflectors of certain wavelengths, which require extremely high reflectivity to reduce losses.
Solar Energy

In concentrated solar power systems, where as much sunlight as possible needs to be reflected and focused onto the collector, silver mirrors are an ideal choice (usually with a robust outer protective layer).