This is a ZnSe-px-50.8-254 50.8 mm Dia. CVD ZnSe Plano-Convex Lens, a high-quality optical component sourced from Alkor Technologies. The lens, which is uncoated, is designed for use with a wavelength of 10600 nm.
The lens is spherical in shape, with a base shape of circular. It has a diameter of 50.8 mm and a thickness at the edge of 2.5 mm. The thickness at the center of the lens is 3.4 mm. The effective focal length (EFL) of the lens is 254 mm, making it suitable for a variety of optical applications.
The lens is made from ZnSe material, specifically from the ZnSe marple-1964 variant. The inner radius of the lens is 0, and the outer radius is also 0. This specific lens is a Plano-Convex type, meaning one side is flat while the other side is curved.
According to the vendor's website, this item is currently in stock. For more detailed information, you can refer to the vendor's website using the provided weblink: http://www.alkor.net/ZnSe_lenses_pcx.html.