LA1213 N-BK7 Plano-Convex Lens; Dia:0.5 in; f=50.0 mm Uncoated

The LA1213 N-BK7 Plano-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 50.0 mm, is designed for use in a wide range of optical systems, including beam shaping, focusing, and collimation.

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 ideal for a wide range of applications. The lens is uncoated, meaning 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 12.7 mm, a thickness at the edge of 1.8 mm, and a thickness at the center of 2.6 mm. The effective focal length (EFL) is 50.0 mm, and the radius of curvature of the first surface (R1) is 25.8 mm. The back focal length (BFL) is 48.1 mm, and both the inner and outer radii are 0 mm.

This lens is a spherical lens, meaning it has a surface that is a portion of a sphere. The spherical shape is a common choice for lenses due to its simplicity and ease of manufacturing. The lens is also plano-convex, meaning one side is flat (plano) and the other side is curved (convex). This design is often used to reduce spherical aberration, a common issue in optical systems.