This is the G311208322 model from Qioptiq Photonics, a 22.4 mm diameter UVFS Double-Convex Lens with an effective focal length (EFL) of 40mm. The lens is sourced from Qioptiq Photonics, a renowned vendor in the field of precision optics.
The lens is a Spherical Lens of the Sub Type Symmetric-Convex, featuring a Base Shape of Circular. The geometry of the lens includes a thickness edge of 1.7mm and a thickness center of 4.9mm. The lens is made from UVFS material with the ID mal-1965.
The lens is designed to operate at a wavelength of 355nm. It comes with a coating on both the front and back surfaces. The front coating is qio bbar arb2visnbk7, and the back coating is also qio bbar arb2visnbk7. This coating enhances the lens's performance and durability.
The lens is currently in stock and available for purchase. For more information, you can visit the provided weblink: https://www.qioptiq-shop.com/en/Precision-Optics/Singlets/Symmetric-Convex-Lenses/Symmetric-convex-lenses-unmounted-fused-silica.html