This is the G063151400, a 31.5 mm diameter mounted double-convex lens from Qioptiq Photonics. The lens is made of N-SK2 Schott material and features a focal length (EFL) of 30mm. The lens is designed for use at a wavelength of 587.6nm and comes with a front and back coating of Qio Silver Ragv 45.
The lens geometry is characterized by its base shape, which is circular. The lens has a thickness of 2mm at the edge and 9.5mm at the center. The inner and outer radii are both 0, indicating a symmetrical lens design. The lens's curvature is defined by a first radius (r1) of 34.721 and a second radius (r2) of -34.721, which are both measured in millimeters.
The lens is mounted and is currently in stock, as indicated by its weblink status. The weblink provided leads to the product page on Qioptiq's website, where users can find more information and place an order.