This is a 092-3130R-4000 UVFS Protected Gold Spherical Plano-Concave Mirror, sourced from EKSMA Optics. The mirror has a diameter of 25.4 mm and a thickness of 6 mm at the edge. It is designed for use at a wavelength of 900 nm.
The mirror features a spherical geometry with a radius of curvature of -4000 mm, resulting in a focal length of -2000 mm. This makes it suitable for applications that require concave mirrors.
The mirror is coated with EKS 0030protgold900 on the front side, which is a protected gold coating specifically designed for use at a wavelength of 900 nm. The UVFS material, identified as UVFS mal- 1965, is used as the base material for this mirror.
For more information about this product, including its availability and pricing, please refer to the vendor's website at https://eksmaoptics.com/optical-components/metallic-mirrors/protected-gold-mirrors/.