This is a high-quality double-convex lens from the renowned optical components manufacturer, Edmund Optics. The lens, identified as item number 89-292, boasts a diameter of 50mm and a focal length of 200mm, making it suitable for a wide range of applications.
The lens is made from the high-grade material n-BK7 Schott, a borosilicate glass known for its excellent optical properties and durability. The lens's geometry features a thickness of 2mm at the edge and 5.05mm at the center, with radii of curvature of 205.86mm for the first surface and -205.86mm for the second surface. The back focal length is 198.33mm, and the lens has no inner or outer radius.
The lens is coated with YAG-BBAR, a highly durable and efficient coating that enhances its performance in the wavelength range of 500-1100nm. This coating reduces reflection and increases transmission, making the lens ideal for use in lasers, beam expanders, and other applications where high transmission and low loss are critical.