LB1869-A N-BK7 Bi-Convex Lens; Dia:1 in; f=500.0 mm ARC 350-700nm

The LB1869-A is a high-quality bi-convex lens offered by Thorlabs, designed for use in a wide range of optical applications. This lens is fabricated from N-BK7, a popular glass type known for its excellent optical properties, making it an ideal choice for applications that require high-performance optics.

The lens features a diameter of 1 inch (25.4 mm) and a focal length of 500.0 mm, providing a large beam diameter and a long focal length. This combination makes it suitable for applications that require a large field of view or a narrow beam divergence. The lens has a double-convex geometry, with radii of curvature of 514.7 mm for the first surface and -514.7 mm for the second surface. This geometry ensures a high level of optical correction, minimizing spherical aberration and other optical distortions.

The lens has a central thickness of 2.3 mm and an edge thickness of 2 mm, providing excellent mechanical stability and resistance to optical misalignment. The lens is coated with a broadband anti-reflection coating, designed to reduce surface reflections and increase transmission in the 350-700 nm spectral range. This coating ensures high light throughput and low loss, making the lens ideal for use in laser systems and other high-power applications.