This is the BF-px-38.1-63, a 38.1 mm diameter Plano-Convex lens made from BaF2 (Barium Fluoride) material. The lens is sourced from Alkor Technologies and is currently in stock, as indicated by its valid weblink status.
The lens features a geometric design with a thickness of 2.1 mm at the edge and 9.4 mm at the center. It has an effective focal length (EFL) of 63.5 mm and a radius of curvature (R1) of 28.38 mm. The lens's inner and outer radii are both zero, indicating a planar surface on one side and a curved surface on the other.
The BF-px-38.1-63 is a spherical lens, and as the 'Uncoated' notation in its name suggests, it does not have any coating applied to its surfaces. This lens is designed to work with a wavelength of 5000 nm.
Please note that this lens is made from BaF2, a material known for its excellent transparency in the ultraviolet, visible, and near-infrared regions of the spectrum. This makes it an ideal choice for various optical applications.