This is a 092-0125FR-1500 25.4 mm Dia. N-BK7 Enhanced Silver Plano-Concave Spherical Mirror, a high-quality optical component sourced from EKSMA Optics. The mirror has a base shape of a circle with a diameter of 25.4 mm and a thickness of 6 mm at the edge.
The mirror's geometry is spherical, with a radius of curvature (R1) of -1500 mm, which results in a focal length (EFL) of -750 mm. This concave mirror is designed to focus light at a point on the opposite side of the mirror.
The mirror is made of N-BK7, a popular optical glass from Schott, which is known for its excellent optical properties and high damage threshold. The mirror's coating is enhanced silver, which provides high reflectivity across a wide spectral range, from 600 nm to 1100 nm. This makes it suitable for various applications, including but not limited to, laser systems, interferometers, and optical spectroscopy.
The mirror's coating is identified as "eks enhsil600110045", and the mirror is currently in stock, as indicated by the "weblink status". For more information, you can visit the vendor's website through the provided weblink.