The 89-257 is a high-quality double-convex lens, designed and manufactured by Edmund Optics. This lens boasts a 20mm diameter and a focal length of 20mm, making it a versatile choice for a variety of optical applications.
The lens is constructed from n-sf11 Schott, a high-index glass with excellent optical properties. The double-convex geometry, with radii of curvature of 30.25mm on both sides, ensures efficient light gathering and focusing. The lens has a central thickness of 5mm and an edge thickness of 1.6mm, providing robustness and durability.
The lens features a YAG-BBAR coating on both the front and back surfaces. This coating, designed for the 500-1100nm wavelength range, enhances the lens's performance by reducing reflection and increasing transmission. The coating ensures high-fidelity light transmission, making the lens ideal for use in laser systems, imaging applications, and other settings where high-quality optical performance is required.