This is the PLCX-25.4-65.0-UV, a Plano-Convex Spherical Lens with a diameter of 25.4 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 a thickness of 2.75 mm at the edge, increasing to 4 mm at the center. It has an effective focal length (EFL) of 130 mm, making it suitable for a variety of optical applications. The lens's curvature is defined by a radius (R1) of 64.96 mm.
The lens is made from UVFS material, identified by the catalog number MAL-1965. The weblink provided leads to a comprehensive PDF document detailing the specifications and applications of this lens and other similar optical elements. According to the vendor's website, this item is currently in stock.