This is a 092-3130R-3000 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 and features a UVFS material ID of 1965.
The mirror's geometry is spherical, with a radius of curvature (R1) of -3000 mm, resulting in a focal length (EFL) of -1500 mm. This curvature and the gold coating on the front surface make it highly reflective at the specified wavelength. The gold coating is protected, ensuring durability and longevity.
For more information about this mirror and similar products, you can visit the EKSMA Optics website at https://eksmaoptics.com/optical-components/metallic-mirrors/protected-gold-mirrors/. The link provided has been verified and the product is currently in stock.