This is a G311718329 double-convex lens, featuring a 31.5 mm diameter and a fused silica material (UVFS). The lens boasts an effective focal length (EFL) of 120mm at a wavelength of 1064nm. The lens's base shape is circular, and it has a symmetric convex-convex design.
The lens's geometry includes an edge thickness of 2.1mm and a center thickness of 4.1mm. The front and back surfaces of the lens are coated with Qioptiq's HP NBAR ARHS-YAG coating, designed for high performance at a wavelength of 355nm. The lens's shape is spherical, and it is sourced from Qioptiq Photonics.
According to the vendor's website, this lens is currently in stock. For more detailed information, you can visit the following link: https://www.qioptiq-shop.com/en/Precision-Optics/Singlets/Symmetric-Convex-Lenses/Symmetric-convex-lenses-unmounted-fused-silica.html