LA1074-C N-BK7 Plano-Convex Lens; Dia:0.5 in; f=20.0 mm ARC 1050-1700nm

The LA1074-C is a high-quality plano-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 has a diameter of 0.5 inches (12.7 mm) and a focal length of 20.0 mm, making it suitable for applications that require a long focal length.

The lens geometry includes a thickness of 1.8 mm at the edge and 4 mm at the center, providing a robust structure while maintaining a low profile. The front and back surfaces of the lens are coated with a broadband anti-reflection coating, optimized for the 1050-1700 nm wavelength range. This coating reduces surface reflections, enhancing transmission and improving overall system performance.

The LA1074-C is a spherical lens, meaning it has a continuously curving surface. This shape is common in optical systems due to its ease of manufacture and the ability to focus light to a point. The lens's inner and outer radii are 0, indicating a plano-convex design, where one surface is flat, and the other is curved. The radius of curvature (R1) of the curved surface is 10.3 mm, and the back focal length (BFL) is 17.3 mm.