LB1374 N-BK7 Bi-Convex Lens; Dia:2 in; f=150.0 mm Uncoated

The LB1374 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 150.0 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 borosilicate crown glass with a low refractive index and low dispersion, making it an ideal choice for many optical applications. The N-BK7 designation indicates that this particular lens meets the specifications set by Schott, a renowned glass manufacturer.

The LB1374 lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or outwardly curved. This shape is often used to collimate or focus light, making it a versatile choice for many optical setups. The lens has a center thickness of 7.2 mm and an edge thickness of 3 mm, providing robustness and durability.

The lens's effective focal length (EFL) is 150.0 mm, which is the distance from the lens at which a collimated beam of light would come to a focus. The back focal length (BFL), which is the distance from the rear surface of the lens to the focus of the collimated beam, is 147.6 mm. The radii of curvature for the first and second surfaces are 153.3 mm and -153.3 mm, respectively.

This lens is uncoated, meaning it does not have any anti-reflective coatings. While coatings can be beneficial for reducing losses due to reflection, an uncoated lens can be a cost-effective choice for applications where such losses are not a significant concern.