This is a 091-3125R-400 12.7 mm Dia. UVFS Protected Silver Plano-Concave Spherical Mirror, with a thickness of 6mm and a central wavelength of 400nm. The mirror is sourced from the reputable vendor, EKSMA Optics, and is currently in stock.
The mirror is a curved mirror of the concave type, with a base shape that is circular. It has a diameter of 12.7mm and a thickness edge of 6mm. The effective focal length (EFL) of the mirror is -200, and its radius of curvature (R1) is -400.
The mirror is made of UVFS material, specifically UVFS mal- 1965. The front surface of the mirror is coated with eks 0025protsil 4000, which is a protected silver coating. The mirror's shape is spherical, which is ideal for a wide range of optical applications.
For more information about this mirror, including its availability and pricing, please refer to the vendor's website at https://eksmaoptics.com/optical-components/metallic-mirrors/protected-silver-mirrors/.