This is the G314423331 model from Qioptiq Photonics, a 22.4 mm diameter Plano-Concave Spherical Lens with a focal length of -100mm. The lens is made of UVFS material, specifically UVFS mal- 1965, and has a center thickness of 1.5mm.
The lens's front and back surfaces are coated with qio al ralvis aoi 45, providing optimal performance for a wavelength of 355nm. The lens's geometry is defined by an inner radius of 0mm and an outer radius of 0mm, indicating a uniform curvature across the lens surface.
The lens's information can be found on Qioptiq Photonics' official website, where it is listed as in stock. This suggests that the lens is readily available for purchase and use in various optical applications.