LB1761-C N-BK7 Bi-Convex Lens; Dia:1 in; f=25.4 mm ARC 1050-1700nm

The LB1761-C is a high-quality bi-convex lens, featuring a spherical design and a circular base shape. This lens is sourced from the reputable vendor, Thorlabs, and is currently in stock, as indicated by its valid weblink status. The lens boasts a diameter of 25.4 mm and a thickness of 1.9 mm at the edge, with a center thickness of 3.4 mm. The effective focal length (EFL) of this lens is 30 mm, and the radii of curvature are 24.5 mm for the first surface and -24.5 mm for the second surface. The back focal length (BFL) is 22.2 mm, and both the inner and outer radii are 0 mm.

This lens is made from n-BK7 Schott, a popular optical glass due to its excellent optical properties. The lens is designed to operate at a wavelength of 633 nm. The front and back surfaces of the lens are coated with tho c bbar, a broadband anti-reflection coating that enhances transmission in the 1050-1700 nm range. This coating reduces surface reflections, thereby increasing the overall efficiency and quality of the optical system in which the lens is used.