LB1909-C N-BK7 Bi-Convex Lens; Dia:2 in; f=500.0 mm ARC 1050-1700nm

The LB1909-C is a high-quality bi-convex lens from Thorlabs, designed with a diameter of 2 inches and a focal length of 500.0 mm. This lens is fabricated from N-BK7, a popular glass type from Schott, known for its excellent optical properties. The lens features a clear aperture, making it suitable for a wide range of applications.

The lens geometry includes a thickness edge of 3 mm and a thickness center of 6.6 mm, providing robustness and stability. The effective focal length (EFL) is 200 mm, and the radii of curvature for the first and second surfaces are 514.4 mm and -514.4 mm, respectively. The back focal length (BFL) is 498.6 mm.

The LB1909-C lens comes with anti-reflection (AR) coatings on both the front and back surfaces, specifically designed for the wavelength range of 1050-1700 nm. These coatings help minimize surface reflections, thereby enhancing transmission and improving overall system performance.

This lens is an excellent choice for applications that require high-quality, broadband optical performance. Its spherical shape ensures excellent imaging quality, making it suitable for use in various systems, including beam shaping, laser applications, and imaging systems.