LB1862-A N-BK7 Bi-Convex Lens; Dia:2 in; f=400.0 mm ARC 350-700nm

The LB1862-A is a high-quality bi-convex lens from Thorlabs, designed for use in a wide range of optical applications. This lens is fabricated from N-BK7 Schott glass, a popular material known for its excellent optical properties and versatility.

The lens features a diameter of 2 inches (50.8 mm) and a focal length of 400.0 mm, making it suitable for applications that require a long focal length. The lens has a double-convex geometry, with radii of curvature of 411.3 mm for the first surface and -411.3 mm for the second surface. This geometry ensures a high level of optical performance, with a large numerical aperture and low spherical aberration.

The lens has a central thickness of 4.6 mm and an edge thickness of 3 mm, providing robustness and durability. The lens is coated with a broadband anti-reflection coating, designed to reduce surface reflections and increase transmission in the spectral range of 350-700 nm. This coating ensures high light transmission and reduces the risk of unwanted reflections or ghost images.