This is a 092-3130R-500 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 protected gold coating on the front surface, denoted as 'eks 0030protgold900'.
The mirror's geometry is spherical, with a radius of curvature (R1) of -500 mm, resulting in a focal length (EFL) of -250 mm. This curvature and the gold coating make it suitable for a wide range of applications, including but not limited to, laser systems, interferometry, and optical testing.
For more information about this product, including pricing and availability, please refer to the vendor's website at https://eksmaoptics.com/optical-components/metallic-mirrors/protected-gold-mirrors/. The link has been verified and the product is currently in stock.