G311357329 31.5 mm Dia. N-BK7 Double-Convex Lens; EFL=70mm 1064nm

This is a G311357329 lens, a high-quality optical component manufactured by Qioptiq Photonics. The lens has a diameter of 31.5 mm and a double-convex geometry, featuring a symmetric design with both surfaces curved outwards. The lens is made of N-BK7, a type of glass known for its excellent optical properties, particularly its low dispersion and high transmission in the visible and near-infrared regions.

The lens has an effective focal length (EFL) of 70 mm, which is the distance from the lens's center to the focal point where light rays converge. This makes the lens suitable for applications that require a moderate level of magnification or optical power. The lens's thickness at the edge is 2.1 mm, while its center thickness is 5.5 mm, providing a robust and durable structure.

The lens features anti-reflection coatings on both surfaces, specifically Qio HP Nbar ARHS-YAG. These coatings are designed to reduce surface reflections and increase transmission, enhancing the lens's performance in applications that involve high-intensity light sources or require high contrast and resolution.

The lens's curvature is defined by its radii of curvature, with R1 being 72.862 mm for the first surface and R2 being -72.862 mm for the second surface. The lens's inner and outer radii are both zero, indicating a uniform curvature across the lens's surface.