This is the PLCX-25.4-2060.0-C, a 25.4 mm diameter Plano-Convex lens from CVI Laser Optics. The lens is made of N-BK7 Schott, a popular material for laser applications due to its excellent optical properties. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties.
The lens has a focal length (EFL) of 4000mm, which is the distance from the lens at which parallel rays of light converge. This makes it suitable for applications that require a long focal length. The lens has a curvature radius (R1) of 2060mm on the convex side. The thickness of the lens at the edge is 4mm, and it is the same at the center.
The lens is sourced from CVI Laser Optics, a reputable vendor known for its high-quality optical elements. According to the vendor's information, the lens is in stock and the web link provided is valid. The lens is part of the Spherical Lenses category, specifically the Plano-Convex subtype, which is characterized by having one flat surface and one curved surface.