This is the G063318400, a 22.4 mm diameter UVFS mounted 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 of the spherical type, specifically a symmetric convex-convex lens, and is mounted on fused silica. The base shape is circular, with a thickness of 1.7mm at the edge and 4.9mm at the center. The lens is designed to operate at a wavelength of 355nm and features a coating of Qio Silver RAGV 45 on both the front and back surfaces.
The lens's geometry is precisely defined, with inner and outer radii of 0 and a first radius (R1) of 39.525mm and a second radius (R2) of -39.525mm. This specific lens is in stock and available for immediate purchase. For more detailed information, please refer to the vendor's website, where you can find this product listed under "Precision Optics" in the "Singlets" category.