Gold Mirror

Gold (Au) mirrors have extremely high reflectivity (typically >98%) in the near-infrared (>800nm) to far-infrared operating bands, especially in the 2-20μm range, while also possessing unparalleled chemical inertness and environmental stability. ECOPTIK provide the round, square and customized shape mirrors with a protected gold coating in various sizes.

High-Power Infrared Laser Systems：CO₂ Laser Processing (10.6μm): Widely used as beam steering and focusing mirrors in industrial laser cutting, welding, and marking equipment. Gold films have extremely high reflectivity (>98%) in this wavelength band and good thermal conductivity, capable of withstanding kilowatt-level high power densities while avoiding thermal lensing effects. Infrared Spectroscopy：Fourier Transform Infrared Spectrometer (FTIR): Used as moving and fixed mirrors in interferometers to maximize reflectivity across the entire infrared band (2-20μm), ensuring the detection intensity of weak signal samples. Space Astronomy：Infrared telescopes and detectors on satellites often operate at low temperatures. Gold's high infrared reflectivity is highly compatible with low-temperature environments and is extremely stable in a vacuum.

Substrate Selection：Monocrystalline silicon substrate: High rigidity and good thermal stability, suitable for applications requiring high power density or lightweight design; K9/fused silica substrate: Low cost and high surface accuracy, suitable for general infrared laboratory systems. Extremely High Infrared Reflectivity：In the infrared band (2μm - 20μm), especially at 10.6μm (CO₂ laser), reflectivity typically reaches R > 98% - 99.5%. This means minimal energy loss in the infrared optical path. In the near-infrared band (800nm - 1600nm), reflectivity is also typically above R > 96% - 98%, suitable for fiber lasers and optical communications. Chemical and Physical Properties：Gold is resistant to oxidation, sulfidation, and corrosion. Pure gold films are relatively soft and easily scratched. A protective film (such as Y₂O₃, SiO₂, etc.) is usually added to the gold film to improve durability and cleanability. High Laser Damage Threshold：In high-power CO₂ laser or fiber laser systems, it can withstand extremely high continuous power (kW level) without damage. It also possesses excellent heat dissipation capabilities.