G311377322 12.5 mm Dia. N-BK7 Double-Convex Lens; EFL=12.5mm 450-700nm

This is a G311377322 model lens from Qioptiq Photonics, a renowned provider of precision optics. The lens, which has a diameter of 12.5 mm, is made of N-BK7, a popular glass type in the optical industry known for its excellent optical properties.

The lens is a double-convex type, meaning it has two spherical surfaces that curve outwards. The first surface, or the front surface, has a radius of curvature (R1) of 11.971 mm, while the second surface, or the back surface, has a radius of curvature (R2) of -11.971 mm. This specific curvature configuration allows the lens to focus light efficiently, making it suitable for various applications.

The lens has an effective focal length (EFL) of 12.5 mm, which is the distance from the lens's principal point to the focal point when the lens is focused at infinity. This EFL value, combined with the lens's diameter, makes it a versatile option for systems that require a compact, high-performance lens.

The lens's thickness at the edge is 1 mm, while its center thickness is 4.5 mm. This thickness distribution ensures the lens's structural integrity and helps minimize optical aberrations.

The lens is coated with qio bbar arb2visnbk7 on both the front and back surfaces. This coating enhances the lens's durability and performance by reducing reflection and increasing transmission in the visible spectrum (450-700 nm).