49-920 18.0mm Dia. x 22.5mm FL; VIS-NIR Coated; Plano-Convex Lens VIS-NIR 400-1000nm

The 49-920 is a Plano-Convex lens, a type of spherical lens, sourced from Edmund Optics. This lens boasts an 18.0mm diameter and a focal length of 22.5mm, making it suitable for a wide range of applications. The lens is made from n-sf11 Schott, a high-index glass with excellent transmittance in the visible to near-infrared (VIS-NIR) spectrum, specifically designed for use in the 400-1000nm range.

The lens features a front and back coating of edm visnir0sp2002000, a VIS-NIR coating that further enhances its performance in the specified wavelength range. This coating is designed to reduce surface reflections, thereby increasing the amount of light transmitted through the lens. The lens has a thickness of 1.53mm at the edge and 4mm at the center, providing a balanced profile for efficient light transmission.

The geometry of the lens is carefully designed to optimize its performance. The inner radius is 0mm, and the outer radius is also 0mm, indicating a symmetrical design. The first radius of curvature (r1) is 17.66mm, and the back focal length (bfl) is 20.26mm. The effective focal length (efl) is 22.5mm, which is a critical parameter in determining the lens's performance in various applications.