LB1761-A N-BK7 Bi-Convex Lens; Dia:1 in; f=25.4 mm ARC 350-700nm

The LB1761-A is a high-quality bi-convex lens, manufactured by the renowned optical components supplier, Thorlabs. This lens boasts a diameter of 1 inch and a focal length of 25.4 mm, making it a versatile choice for a wide range of optical applications.

The lens is crafted from N-BK7, a type of borosilicate glass known for its excellent optical properties. This material is particularly prized for its low optical dispersion, high homogeneity, and exceptional transmission in the visible spectrum. The N-BK7 designation indicates that this lens is made from Schott glass, a brand recognized for its superior quality and consistency.

The LB1761-A features a spherical shape, with both surfaces curved outwards. This design, also known as a bi-convex lens, is characterized by its ability to converge light rays to a single point, making it ideal for focusing or collimating light. The lens has a front radius of curvature (R1) of 24.5 mm and a back radius of curvature (R2) of -24.5 mm, further enhancing its focusing capabilities.

The lens has an effective focal length (EFL) of 25.4 mm, which is the distance from the lens's principal point to the focal point. This measurement is crucial in determining the lens's magnification power and field of view.

The LB1761-A is coated with a broadband anti-reflection coating, designed to reduce surface reflections and increase transmission in the 350-700 nm range. This coating enhances the lens's performance in a variety of applications, including imaging, laser systems, and interferometry.