G311320525 22.4 mm Dia. N-BK7 Double-Convex Lens; EFL=200mm 725-1050nm

This is a high-quality double-convex lens from Qioptiq Photonics, designed for precision optical applications. The lens has a diameter of 22.4 mm and a thickness of 2.4 mm at the edge, with a center thickness of 3 mm. The effective focal length (EFL) of this lens is 200 mm, making it suitable for applications requiring a longer focal length.

The lens is made from N-BK7, a popular optical glass known for its excellent optical properties. This material is characterized by a high refractive index and low dispersion, making it ideal for a wide range of optical applications. The lens is designed to operate within the wavelength range of 725-1050 nm, which covers a significant portion of the near-infrared spectrum.

The lens features broadband anti-reflection coatings on both the front and back surfaces. These coatings, identified as 'qio bbar arb2nirnbk7', are designed to minimize surface reflections and increase transmission, thereby enhancing the overall performance of the lens.

The lens geometry is spherical, with radii of curvature of 209.83 mm for both the front and back surfaces. This symmetric design ensures a high degree of optical symmetry, which can be beneficial in many applications.