LB1450 N-BK7 Bi-Convex Lens; Dia:0.5 in; f=20.0 mm Uncoated

The LB1450 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 0.5 inches and a focal length of 20.0 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's geometry includes a diameter of 12.7 mm, an edge thickness of 1.8 mm, and a center thickness of 3.9 mm. The effective focal length (EFL) is 20 mm, and the radii of curvature for the first and second surfaces are 19.9 mm and -19.9 mm, respectively.

The lens's design is spherical, which is a common shape for lenses due to its ease of manufacturing and good optical performance. The back focal length (BFL) is 18.7 mm, and the lens has no inner or outer radius, indicating a uniform thickness.

Notably, this lens is uncoated. While coatings can enhance the performance of lenses by reducing reflection, increasing transmission, or providing other benefits, an uncoated lens can be suitable for many applications, especially where cost or simplicity is a consideration.

The lens's intended wavelength is 587.6 nm, which falls within the visible light spectrum. This makes it suitable for applications involving visible light, such as microscopy, machine vision, or other applications where light in the visible spectrum is used.