49-989 9mm Dia. x 27mm FL; UV-AR Coated; UV Double-Convex Lens UV-AR 250-425nm

The 49-989 is a high-quality spherical lens, boasting a 9mm diameter and a 27mm focal length, sourced from the renowned optical vendor, Edmund Optics. This lens is designed for use within the ultraviolet (UV) spectrum, specifically between 250-425nm, making it an ideal choice for applications such as UV imaging, spectroscopy, and other UV-based research and industrial uses.

The lens is fabricated from fused silica, a material known for its excellent transparency in the UV range, and its high resistance to thermal shock and chemical etching. The front and back surfaces of the lens are coated with a UV-AR coating, which is standard for Edmund Optics and provides superior anti-reflection properties, further enhancing the lens's performance within the UV spectrum.

The lens's geometry is characterized by a double-convex shape, with radii of curvature of 24.36mm and -24.36mm for the first and second surfaces, respectively. This design results in a back focal length of 26.13mm and an effective focal length of 27mm. The lens has an edge thickness of 1.66mm and a center thickness of 2.5mm, providing a robust and durable structure.