LB1859-C N-BK7 Bi-Convex Lens; Dia:2 in; f=1000.0 mm ARC 1050-1700nm

The LB1859-C 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, a popular glass type known for its excellent optical properties, making it an ideal choice for applications that require high-performance lensing.

The lens features a diameter of 2 inches, providing a substantial surface area for light transmission. It has a focal length of 1000.0 mm, which is a common choice for many optical systems due to its versatility. The lens's design includes an anti-reflection coating, specifically designed for the wavelength range of 1050-1700nm, which helps to reduce surface reflections and increase transmission efficiency.

The lens's geometry is another notable feature. It has a thickness of 3mm at the edge and 5.5mm at the center, providing a robust structure. The lens's front and back surfaces have radii of curvature of 1029.5mm and -1029.5mm, respectively, which contribute to its excellent focusing capabilities. The back focal length is 998.8mm, and the lens has no inner or outer radius, indicating a uniform curvature.