This is a 092-0115R-250 25.4 mm Dia. N-BK7 Protected Aluminium Spherical Plano-Concave Mirror, with a thickness of 6mm and a coating optimized for a wavelength of 300nm. The mirror is sourced from the reputable vendor, EKSMA Optics, and is currently in stock, as indicated by its weblink status.
The mirror is a curved mirror of the concave type, featuring a base shape that is circular. The geometry of the mirror includes a diameter of 25.4mm, a thickness edge of 6mm, and an effective focal length (EFL) of -125mm. The radius of curvature (R1) is -250mm.
The mirror is made of N-BK7 Schott, a popular optical glass known for its excellent optical properties. The coating on the front surface of the mirror is EKS 0015PROTAL 3000, which is specifically designed for use at a wavelength of 300nm.
For more information about this mirror, please refer to the vendor's website at https://eksmaoptics.com/optical-components/metallic-mirrors/protected-aluminium-mirrors/.