Metal Coating Broadband Dielectric Mirrors Elliptical UV Fused BK7

Offered Dielectric Coatings,Metal Coating Broadband Elliptical Mirrors

Elliptical mirrors feature a coated face on an elliptical UV fused silica substrate or an elliptical fused silica substrate. When the mirror is rotated by 45° about the minor axis, the resulting clear aperture is circular.

Broadband dielectric coated mirrors offer high reflectance in the NIR range (750 - 1100 nm). Although broadband dielectric coatings offer smaller operating wavelength ranges than metallic coatings, they typically yield higher reflectance in those ranges than their metallic counterparts.

Protected-aluminum-coated mirrors are a good option for many general broadband applications. An SiO2 coating is used to protect the delicate aluminum coating, making it suitable for laboratory and industrial use. The protected aluminum coating has a smaller chance of tarnishing than protected silver in a high humidity environment, and gives a reflectance that most closely matches the reflectance of a bare aluminum coating. These mirrors have an average reflectance greater than 90% from 450 nm to 2 µm and greater than 95% over their 2 - 20 µm spectral range.

Protected gold coatings are ideal for use over the entire IR range, with an average reflectance in excess of 96% for 800 nm - 20 µm. A protective SiO2 overcoat is layered over the gold to make it damage resistant and easy to clean.

Due to its broad transmission range and opacity in the visible portion of the spectrum, germanium is well suited for IR laser applications. As indicated by the plots in the Graphs tab, germanium also acts as a longpass filter for wavelengths greater than 2 µm. In addition, germanium is inert to air, water, alkalis, and many acids. Germanium's transmission properties are highly temperature sensitive; in fact, the absorption becomes so large that germanium is nearly opaque at 100 °C and completely non-transmissive at 200 °C.

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