49-540 6mm Dia. x -6mm FL; NIR I Coated; Double-Concave Lens 600-1050nm

The 49-540 is a double-concave lens with a 6mm diameter and a focal length of -6mm, making it a negatively powered lens. This lens is sourced from Edmund Optics, a reputable vendor known for its high-quality optical components. The lens is designed for use within the near-infrared (NIR) spectrum, specifically between 600nm and 1050nm, making it suitable for a wide range of NIR applications.

The lens is made from n-SF11 Schott, a high-index glass with excellent transmittance in the NIR region. This material allows for a compact lens design, making it an ideal choice for space-constrained applications. The lens features a standard anti-reflection coating, specifically the EDM NIR-I coating, on both the front and back surfaces. This coating is designed to minimize surface reflections and increase transmission within the NIR spectrum, further enhancing the lens's performance in its intended application range.

The lens's geometry includes an edge thickness of 2.29mm and a center thickness of 1.5mm. The front and back radii of curvature are -9.74mm and 9.74mm, respectively, resulting in a back focal length of -6.41mm. The lens's shape is spherical, which is a common and reliable choice for many optical systems due to its simplicity and manufacturability.