This is the G063342329 model from Qioptiq Photonics, a 22.4 mm diameter Plano-Convex lens with a UVFS mount. The lens is designed for use with a focal length of 100mm and is optimized for the 1064nm wavelength.
The lens is spherical in shape, with a plano surface on one side and a convex surface on the other. The convex surface has a radius of curvature of 50.481mm. The lens has an edge thickness of 1.5mm and a center thickness of 2.8mm.
The lens is made from UVFS material, which is known for its excellent transmission properties in the ultraviolet, visible, and near-infrared regions of the spectrum. The lens is coated with Qio HP Nbar ARHS-YAG on both the front and back surfaces, which provides high reflection and low absorption at the YAG laser wavelength.
This lens is available for purchase from the Qioptiq Photonics website, where it is listed as being in stock. The website also provides further technical specifications and datasheets for the lens.