LB1309 N-BK7 Bi-Convex Lens; Dia:2 in; f=75.0 mm Uncoated

The LB1309 N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs, a leading vendor in the field of precision photonics. This lens, with a diameter of 2 inches and a focal length of 75.0 mm, is designed for use in a wide range of optical systems, including imaging, beam shaping, and laser applications.

The lens is made from N-BK7, a popular glass type known for its excellent optical properties. This material, also known as BK7, is a crown glass with a low refractive index and low dispersion, making it an ideal choice for many optical applications. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties. However, uncoated lenses can still provide high-quality performance in many applications.

The geometry of the lens includes a diameter of 50.8 mm, an edge thickness of 3 mm, and a center thickness of 11.8 mm. The effective focal length (EFL) is 75 mm, and the back focal length (BFL) is 71 mm. The lens surfaces have radii of curvature of 75.2 mm and -75.2 mm, respectively. The lens does not have an inner radius or an outer radius.

This lens is a spherical lens with a convex-convex shape, meaning both surfaces are curved outwards. This shape is often used in optical systems where a high degree of focusing is required. The lens is designed to work at a wavelength of 587.6 nm, which is in the visible light spectrum.