This is a G063318525 model lens, a product of Qioptiq Photonics, a renowned vendor in the field of precision optics. The lens is spherical in shape, specifically a symmetric convex-convex lens, and is mounted on fused silica, also known as UVFS.
The lens has a base shape of a circle with a diameter of 22.4 mm. The edge thickness is 1.7 mm, while the center thickness is 4.9 mm. The effective focal length (EFL) of the lens is 40 mm. The first radius of curvature (R1) is 39.525 mm, and the second radius of curvature (R2) is -39.525 mm, indicating a double-convex lens. The inner and outer radii are both 0 mm.
The lens is made of a material with the ID "uvfs mal- 1965". It is designed to operate at a wavelength of 355 nm. The lens is coated on both the front and back with "qio bbar arb2nirnbk7", a type of broadband anti-reflection coating that enhances transmission and reduces surface reflections.
This lens is currently in stock and available for purchase on the Qioptiq Photonics website. For more information, please refer to the provided weblink.