This is a G311328329 6 mm Dia. N-BAK4 Double-Convex Lens, specifically designed for use with a center wavelength of 587.6 nm. The lens is sourced from the reputable vendor Qioptiq Photonics, and it is currently in stock with valid weblinks provided for further information.
The lens is of the Spherical type, with a Sub Type of Spherical Lens (Convex-Convex). It has a Base Shape of Circular and a diameter of 6 mm. The lens's thickness at the edge is 0.9 mm, while its thickness at the center is 2.9 mm. The Effective Focal Length (EFL) of the lens is 5 mm.
The lens's first radius of curvature (r1) is 5.085 mm, and the second radius of curvature (r2) is -5.085 mm. The Inner Radius is 0, and the Outer Radius is also 0. The lens is made of N-BAK4 material, specifically from the Schott brand.
The lens features a coating on both the front and back surfaces. The front coating is Qio HP Nbar Arhs-Yag, and the back coating is also Qio HP Nbar Arhs-Yag. This coating enhances the lens's performance and durability.