LB1391 N-BK7 Bi-Convex Lens; Dia:1 in; f=400.0 mm Uncoated

The LB1391 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 1 inch and a focal length of 400.0 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 high refractive index and low dispersion, making it ideal for applications that require high image quality and low chromatic aberration. The lens is uncoated, meaning it does not have any additional layers to enhance its optical performance or protect it from environmental factors.

The geometry of the lens is spherical, with both surfaces curved outwards. The radius of curvature for the first surface is 411.7 mm, while for the second surface it is -411.7 mm. This bi-convex design provides a large field of view and low spherical aberration, making it suitable for a wide range of applications.

The lens has a thickness of 2 mm at the edge and 2.4 mm at the center. The effective focal length (EFL) is 400.0 mm, and the back focal length (BFL) is 399.2 mm. The lens does not have any inner or outer radius, indicating a uniform thickness across the lens.