G311339322 31.5 mm Dia. N-BK7 Double-Convex Lens; EFL=40mm 450-700nm

This is a G311339322 model lens from Qioptiq Photonics, a renowned vendor in the field of precision optics. The lens, which has a base shape of a circle, is a symmetric convex-convex spherical lens, specifically designed for use in the visible light spectrum, with a central wavelength of 587.6 nm.

The lens has a diameter of 31.5 mm and a thickness at the edge of 2.1 mm, while the center thickness is 8.3 mm. The effective focal length (EFL) of the lens is 40 mm, making it suitable for a variety of optical applications. The lens is made from N-BK7, a popular type of borosilicate glass known for its excellent optical properties, including a high refractive index and low dispersion.

The lens features anti-reflective coatings on both the front and back surfaces. These coatings, identified as 'qio bbar arb2visnbk7', are designed to reduce surface reflections and increase transmission in the visible light range, specifically between 450 and 700 nm. This coating ensures optimal performance and minimal loss of light due to reflection.

Please note that the inner and outer radii of the lens are not specified in the provided data. However, the first radius of curvature (r1) is 41.867 mm, and the second radius of curvature (r2) is -41.867 mm, indicating that this is a double-convex lens.