LB1157 N-BK7 Bi-Convex Lens; Dia:6.0 mm; f=10.0 mm Uncoated

The LB1157 is a high-quality Bi-Convex lens from Thorlabs, designed for use in a wide range of optical applications. This lens is made from N-BK7, a popular glass type known for its excellent optical properties, particularly its high transmission across a broad spectrum.

The lens features a diameter of 6.0 mm and a focal length of 10.0 mm, making it a versatile choice for many setups. The Bi-Convex design, with both surfaces curved outwards, provides a strong focusing power, ideal for applications that require a tight beam convergence.

The geometry of the lens includes a thickness of 1.5 mm at the edge and 2.4 mm at the center, providing structural integrity while minimizing unnecessary weight. The effective focal length (EFL) is 10.0 mm, and the radii of curvature for the first and second surfaces are 9.9 mm and -9.9 mm, respectively. The back focal length (BFL) is 9.2 mm.

This lens is uncoated, offering a cost-effective solution for applications where coating is not critical. However, for environments where scratch resistance, anti-reflection, or other surface treatments are necessary, Thorlabs offers a variety of coating options that can be customized to meet specific requirements.