This is the 89-453 Nd:YAG IBS Low Loss Laser Line Mirror, a high-quality optical component sourced from Edmund Optics. It is a Dielectric Mirror with a Circular base shape and a diameter of 25.4mm, making it suitable for a wide range of applications.
The mirror has a thickness of 5mm and is made from fused sil mal-1965, a material known for its excellent optical properties. The coating on the front surface is 'edm dcurv8945345aoi', which is specifically designed for low loss and high reflectivity in the 1030-1064nm wavelength range.
The mirror's shape is that of a Thin Lens, which can be beneficial in certain optical systems. The vendor, Edmund Optics, lists this item as in stock and provides a link to their website for more information.