LB1757 N-BK7 Bi-Convex Lens; Dia:1 in; f=30.0 mm Uncoated

The LB1757 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 1 inch and a focal length of 30.0 mm, is designed for use in a wide range of optical systems, making it a versatile choice for various applications.

The lens is made of N-BK7, a type of borosilicate glass known for its excellent optical properties. This material is often used in high-precision optical systems due to its low coefficient of thermal expansion and high homogeneity. The N-BK7 designation indicates that this lens is made from Schott glass, a reputable manufacturer known for its high-quality optical materials.

The LB1757 lens features a bi-convex geometry, meaning it has two spherical surfaces that are both convex, or curved outward. This shape is often used in optical systems to focus or collimate light. The lens has an effective focal length (EFL) of 30.0 mm, which is the distance from the lens to the point where it focuses or collimates light.

The lens has a diameter of 1 inch (25.4 mm), and its edge thickness is 2 mm, while its center thickness is 7.7 mm. The back focal length (BFL) of the lens is 27.3 mm, which is the distance from the rear surface of the lens to its focal point. The lens does not have any inner or outer radius, indicating that it is a simple bi-convex lens without any additional features.

Notably, this lens is uncoated. While coatings can be applied to lenses to reduce reflection, increase transmission, or protect the lens surface, an uncoated lens can be a suitable choice in certain applications, such as when cost or simplicity is a priority.