87-972 50 mm Dia. Germanium Positive Meniscus Lens; EFL=100mm BBAR 8-12µm

This is a 50 mm diameter Germanium positive meniscus lens, featuring an effective focal length (EFL) of 100mm and broadband anti-reflection (BBAR) coating for the 8-12µm wavelength range. The lens is sourced from Edmund Optics and is currently in stock.

The lens has a base shape of a circle and a spherical geometry. The thickness at the edge is 3.8 mm, while the center thickness measures 5 mm. The front and back radii of curvature are 107.03 mm and 160.46 mm, respectively, resulting in a back focal length (BFL) of 96.49 mm. The inner and outer radii are both zero, indicating a uniform curvature.

The lens is made of germanium burnett material, which is known for its excellent transmission properties in the infrared region. The BBAR coating on both the front and back surfaces further enhances the lens' performance by reducing surface reflections, thereby increasing transmission and minimizing ghosting and flare.

This lens is suitable for applications that require high-quality imaging in the infrared spectrum, such as thermal imaging, night vision, and scientific research. Its positive meniscus design provides superior image quality, making it an ideal choice for demanding optical systems.