This is the PLCX-50.8-180.3-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 inner radius of 0 mm and outer radius of 0 mm, with a thickness at the edge of 4.6 mm and a center thickness of 6.4 mm. The Effective Focal Length (EFL) of this lens is 360.8 mm, making it suitable for a variety of optical applications.
The material of this lens is UVFS, with a catalog number of MAL-1965. The lens's weblink status is valid and it is currently in stock. For more detailed specifications, users can refer to the provided weblink: https://www.idexot.com/media/wysiwyg/cms-pages/pdf/2-Spherical_Lenses.pdf