LB1212 N-BK7 Bi-Convex Lens; Dia:9.0 mm; f=20.0 mm Uncoated

The LB1212 N-BK7 Bi-Convex Lens is a high-quality optical component sourced from Thorlabs, a leading vendor in the field of optical equipment. This lens, with a diameter of 9.0 mm, is designed for use at a focal length of 20.0 mm, making it suitable for a wide range of optical applications.

The lens is made from N-BK7, a type of borosilicate glass manufactured by Schott AG, which is known for its excellent optical properties. This material is characterized by a low coefficient of thermal expansion, making it resistant to thermal shock. It also has a high homogeneity and a low optical dispersion, which contributes to its high optical quality.

The lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or outwardly curved. This shape is often used in optical systems because it can focus light to a point, making it ideal for applications such as imaging and laser beam shaping.

The geometry of the lens includes a thickness of 1.8 mm at the edge and 2.8 mm at the center. The effective focal length (EFL) is 20.0 mm, while the back focal length (BFL) is 19.0 mm. The radii of curvature for the first and second surfaces are 20.1 mm and -20.1 mm, respectively.

Notably, this lens is uncoated. While coatings can be applied to lenses to reduce reflection, increase transmission, or provide other benefits, an uncoated lens can be advantageous in certain applications. For instance, an uncoated lens can be used in systems where broadband anti-reflection coating is not required.

For more information about this lens, including its availability and pricing, please refer to the vendor's website using the provided web link.