This is the PLCX-50.8-50.0-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 its diameter, thickness at the edge (2.59 mm), and thickness at the center (9.53 mm). The Effective Focal Length (EFL) is 100 mm, and the radius of curvature (R1) is 49.97 mm. The lens does not have an inner or outer radius.
The lens is made of UVFS material, identified by the Mal-1965 Material ID. The item data indicates that this lens is in stock and available for immediate purchase. The vendor's website provides further technical specifications and purchasing information.