This is the PLCX-50.8-1030.2-UV, a Plano-Convex Spherical Lens with a diameter of 50.8 mm, sourced from CVI Laser Optics. The lens is designed for use with a wavelength of 266 nm and is uncoated.
The lens's geometry is characterized by an outer radius of 0, an inner radius of 0, and a thickness at the edge of 6.1 mm. The center thickness is slightly more, at 6.4 mm. The Effective Focal Length (EFL) of this lens is 2062 mm, as determined by its radius of curvature of 1030.2 mm.
The lens is made from UVFS material, specifically identified as MAL-1965 in the material ID. The weblink provided leads to a comprehensive catalog of CVI Laser Optics' spherical lenses, where users can find more detailed information about this particular lens and its specifications.
According to the vendor's website, this item is currently in stock, making it readily available for immediate use.