This is a 091-3115R-75 12.7 mm Dia. UVFS Protected Aluminium Spherical Plano-Concave Mirror, with a thickness of 6mm and a central wavelength of 300nm. The mirror is sourced from the reputable vendor, EKSMA Optics, and is currently in stock.
The mirror is a curved type, specifically concave, with a base shape of a circle. It has a diameter of 12.7mm and a thickness edge of 6mm. The effective focal length (EFL) of this mirror is -37.5, and the radius of curvature (R1) is -75.
The mirror is made of UVFS Mal- 1965 material, which is a type of aluminium. The coating on the front surface is EKS 0015protal 3000. This mirror's shape is spherical, and it is designed to reflect light at a specific wavelength, in this case, 300nm.
For more information about this mirror, including its availability and pricing, please refer to the provided weblink: https://eksmaoptics.com/optical-components/metallic-mirrors/protected-aluminium-mirrors/