This is a 32-276-566 317.5 mm Dia. Borofloat Precision Parabolic Mirror, featuring a focal length of 1905mm and a protected gold coating suitable for wavelengths ranging from 700 to 10000nm. The mirror is sourced from the reputable vendor, Edmund Optics, and is currently in stock with valid weblinks provided for reference.
The mirror is designed in a parabolic shape, which is a type of concave mirror that reflects light parallel to its axis to a single point, the focal point. This particular model has a diameter of 317.5mm and a thickness at the edge of 54.1mm. The radius of curvature is 3810mm.
The mirror is made of borofloat33, a type of glass known for its excellent thermal stability and chemical resistance. The front surface of the mirror is coated with a protected gold coating, identified as "edm prgold 700-10000". This coating enhances the mirror's reflectivity across the specified wavelength range.