87-996 50mm Dia. Germanium Infrared Aspheric Lens; EFL=50mm; NA=0.5 BBAR 3-5µm

This is the 87-996 model from Edmund Optics, a 50mm diameter Germanium Aspheric Lens designed for infrared applications with a wavelength of 4000nm. The lens boasts an EFL (Effective Focal Length) of 50mm and a high numerical aperture (NA) of 0.5, making it suitable for a wide range of optical systems.

The lens is made from Germanium, a material known for its excellent transmission properties in the infrared spectrum. It features a BBAR (Broadband Anti-Reflection) coating on both the front and back surfaces, which significantly reduces surface reflections and increases transmission, particularly in the 3-5µm range.

The lens geometry is intricately designed with an inner radius of 0mm, an outer radius of 0mm, and a thickness of 2.52mm at the edge. The center thickness is 5.1mm, and the lens has a base shape of a circle. The aspheric design of the lens helps to correct spherical aberration and coma, providing superior image quality.

The lens has a high refractive index, which allows for the design of compact and lightweight optical systems. The aspheric surface is defined by the coefficients k1 and k2, both of which are 0 in this case, indicating a high degree of precision in the manufacturing process.

The lens is currently in stock and available for immediate purchase through the provided weblink. With its high-quality materials, advanced design, and excellent performance, this lens is an excellent choice for any infrared optical system.