This is a 38.1 mm diameter Germanium Plano-Convex lens, sourced from Alkor Technologies. The lens is uncoated and features an effective focal length (EFL) of 50.8mm. The lens is designed for use with a wavelength of 10600nm.
The lens has a base shape of circular and is spherical in geometry. The thickness at the edge of the lens is 2mm, while the thickness at the center is 3.2mm. The inner and outer radii of the lens are 0. The lens is made of Germanium Burnett material.
The lens is in stock and available for purchase. For more detailed information, please refer to the vendor's website at http://www.alkor.net/germanium_lenses.html.