This is a 50.8 mm diameter Germanium Plano-Convex lens, sourced from Alkor Technologies. The lens is uncoated and has an effective focal length (EFL) of 127mm. The lens geometry includes a thickness of 2.5mm at the edge and 3.3mm at the center. The lens is designed for use with a wavelength of 10600nm.
The lens is spherical in shape, with an inner radius of 0mm and an outer radius of 0mm. The base shape is circular, and the lens is a part of the Spherical Lens (Plano-Convex) sub-type. The Material ID for this lens is 'germanium burnett'.
For more information and to check the availability of this lens, please visit the vendor's website using the provided weblink: http://www.alkor.net/germanium_lenses.html. The weblink status indicates that the lens is currently in stock.