This is a 38-904 19.1mm Dia. 1064nm 0-45° Nd:YAG Laser Line Mirror Dielectric, sourced from the renowned optical components vendor, Edmund Optics. The mirror, with a circular base shape and a diameter of 19.1mm, is designed to work specifically with the Nd:YAG laser line at a wavelength of 1064nm.
The mirror's geometry includes a thickness of 6.35mm, and it is made from fused silica, identified as fused sil mal-1965 in the item data. The coating on the front surface is edm dcurv389040aoi, which is a dielectric coating, typically used to enhance the mirror's reflectivity for the specified laser line.
The mirror is shaped as a thin lens, suggesting it may have specific optical properties or be designed to work in certain optical systems. According to the vendor's information, this item is currently in stock, and you can find more details, including pricing and delivery options, on the Edmund Optics website.