The LA1978-A is a high-quality plano-convex lens from Thorlabs, designed for use in a wide range of optical applications. This lens is made from N-BK7 glass, a popular material known for its excellent optical properties and high damage threshold.
The lens has a diameter of 1 inch (25.4 mm) and a focal length of 750.0 mm, making it suitable for use in systems where a long focal length is required. The lens is spherical, with a radius of curvature of 386.3 mm on the curved (convex) side. The flat side of the lens, or the planar side, has an inner radius of 0 mm and an outer radius of 0 mm.
The lens has a thickness of 2 mm at the edge and 2.2 mm at the center. The effective focal length (EFL) of the lens is 750 mm. The back focal length (BFL) is 746.1 mm.
The LA1978-A lens is coated with Thorlabs' anti-reflection coating, which is designed to reduce surface reflections and increase transmission in the 350-700 nm range. This coating is applied to both the front and back surfaces of the lens.