This is a G063874322 25.4 mm Dia. N-BK7 Mounted Plano-Concave Lens, specifically designed for use in the visible light spectrum, with a center wavelength of 588nm. The lens is sourced from the reputable vendor Qioptiq Photonics, and is currently in stock, as indicated by its weblink status.
The lens is of the Spherical type, with a Sub Type of Spherical Lens (Plano-Concave). It has a base shape of Circular, and a diameter of 25.4mm. The lens's thickness at the center is 1.5mm, and it has an Effective Focal Length (EFL) of -500mm. The Inner Radius and Outer Radius are both 0mm, and the radius of curvature (R1) is -260.39mm.
The lens is made from N-BK7 Schott, a popular material in the optical industry due to its excellent optical properties. It is mounted, making it ready for immediate use in your optical system.
The lens features a coating on both the front and back surfaces. This coating, identified as qio bbar arb2visnbk7, is designed to enhance the lens's performance in the visible light spectrum.