67-644 20mm Dia. x 50mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

The 67-644 is a high-quality double-convex lens, designed and manufactured by Edmund Optics, a leading global provider of optical components. This lens boasts a 20mm diameter and a focal length of 50mm, making it suitable for a wide range of applications.

The lens is constructed from N-BK7 Schott, a popular optical glass due to its excellent transparency in the visible and near-infrared regions. The lens features a double-convex geometry, with radii of curvature of 51.08mm for both the front and back surfaces. This geometry provides a high degree of focusing power, making the lens ideal for imaging applications.

The 67-644 lens is coated with Edmund Optics' NIR-II standard curve coating on both the front and back surfaces. This coating enhances the lens' performance in the near-infrared region, specifically between 750nm and 1550nm. It ensures high transmission and low reflectance, which are crucial for applications such as night vision, thermal imaging, and spectral analysis.

The lens has an edge thickness of 1.52mm and a center thickness of 3.5mm, providing robustness and durability. The back focal length is 48.84mm, and the lens has no inner or outer radius, indicating a uniform thickness across the lens.