This is a LA7753-E4 Plano-Convex Lens from Thorlabs, designed with a 25.4 mm diameter and a focal length of 1000mm for the wavelength of 10600nm. The lens is made of ZnSe material, specifically the ZnSe Marple-1964 variant, and features a front and back coating of tho e4znsearc2000130.
The lens's geometry includes a 2mm edge thickness and a 2.1mm center thickness. The inner and outer radii are both 0, and the curvature radius of the first surface (R1) is 1402.7. The lens is spherical in shape and is available with an Anti-Reflection Coating (AR) for enhanced performance.
The vendor, Thorlabs, provides a weblink to access more information about the product, which is currently in stock. The link is valid and offers further insights into the specifications and applications of the LA7753-E4 lens.