This is the G311718331 model from Qioptiq Photonics, a 31.5 mm diameter UVFS Double-Convex Lens with an effective focal length (EFL) of 120mm. The lens is sourced from Qioptiq Photonics, a renowned vendor in the optical industry, and is available for purchase on their website, where it is currently in stock.
The lens is a Spherical Lens of the Sub Type Symmetric-Convex, featuring a Base Shape of Circular geometry. The lens's thickness at the edge is 2.1mm, while its center thickness is 4.1mm. The lens is made from UVFS material with the ID mal- 1965 and is designed to operate at a wavelength of 355nm.
The lens's front and back surfaces are coated with qio al ralvis aoi 45, providing optimal performance for specific applications. The lens's shape is Spherical, and it does not have any Inner or Outer Radius specified.