Gold-coated mirrors are a type of optical metal film reflector widely used in infrared spectroscopy, particularly when the application wavelength exceeds 1000nm. The reflectivity of these mirrors can reach 98% or more, and in some specific designs, it can even exceed 99%. Since gold film is relatively soft and prone to scratches, these mirrors are usually coated with a protective layer of about 100nm thick SiO2 or other materials like MgF2 on their outermost layer.
Gold-coated mirrors are characterized by their high reflectivity, wide cutoff bandwidth, good neutrality, and small polarization effect. The strength and stability of the gold film are superior to other metals, making it commonly used in infrared reflectors. Additionally, gold film window plates are widely used in infrared imaging systems and medical equipment.
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