This is a 091-0115R-75 Protected Aluminium Spherical Plano-Concave Mirror, sourced from EKSMA Optics. The mirror has a circular base shape with a diameter of 12.7 mm and a thickness edge of 6 mm. The effective focal length (EFL) of this mirror is -37.5 mm, and its radius of curvature (R1) is -75 mm, making it a concave mirror.
The mirror is made of N-BK7 Schott, a popular optical glass known for its excellent optical properties and high damage threshold. It is designed to operate at a wavelength of 300 nm.
The mirror's front surface is coated with EKS 0015PROTAL 3000, a type of protected aluminium coating. This coating provides high reflectivity and durability, making the mirror suitable for various applications.
Please note that the vendor's website indicates that this item is in stock, and you can find more information about it at the following link: https://eksmaoptics.com/optical-components/metallic-mirrors/protected-aluminium-mirrors/