LB1859 N-BK7 Bi-Convex Lens; Dia:2 in; f=1000.0 mm Uncoated

The LB1859 N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs, a leading global vendor in the field of optics and photonics. This lens boasts a focal length of 1000.0 mm, making it suitable for a wide range of applications that require long focal lengths.

The lens is constructed 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 systems. The N-BK7 designation indicates that this particular lens is made from Schott glass, a renowned manufacturer known for its high-quality optical materials.

The LB1859 lens features a bi-convex geometry, meaning it has two convex surfaces. This shape is often used in optical systems to converge or diverge light rays. The lens has a diameter of 2 inches (50.8 mm) and a thickness of 3 mm at the edge, increasing to 3.6 mm at the center. The effective focal length (EFL) is 1000.0 mm, and the back focal length (BFL) is 998.8 mm.

Notably, this lens is uncoated. While coatings can be applied to enhance the lens's performance in specific applications, such as reducing reflection or increasing transmission, this lens is designed to provide optimal performance in its uncoated state.

For more detailed information, including technical specifications and purchasing options, please refer to the vendor's website at https://www.thorlabs.com/thorproduct.cfm?partnumber=LB1859. The link has been verified and indicates that the product is currently in stock.