This is the G311718322 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 measures 4.1mm. The lens is made from UVFS material with the Mal-1965 ID.
The G311718322 model is designed for use with a wavelength of 355nm. It comes with a front and back coating of Qio Bbar Arb2visnbk7, providing optimal performance and durability.