68-246 25mm Dia. Germanium Infrared Aspheric Lens; EFL=25mm; NA=0.5 BBAR 3-5µm

This is a high-quality 25mm diameter germanium aspheric lens, catalog number 68-246, available from Edmund Optics. The lens is specifically designed for infrared applications, with a wavelength of 4000nm. It features a broadband anti-reflection coating (BBAR) that enhances transmission in the 3-5µm range, ensuring optimal performance in infrared systems.

The lens has an effective focal length (EFL) of 25mm, providing a compact and efficient optical solution. The numerical aperture (NA) is 0.5, indicating a wide acceptance angle and high light-gathering capability. The lens is made from germanium burnett, a high-refractive index material that is ideal for infrared applications.

The lens geometry is carefully designed for superior performance. It has an inner radius of 0mm and an outer radius of 0mm, ensuring excellent optical quality. The thickness at the edge is 2.32mm, while the thickness at the center is 3.45mm, providing robustness and durability. The lens features a front radius (r1) of 26.93mm and a back radius (r2) of 37.8mm, which are precisely engineered for optimal imaging.

The lens is coated with edm arcedgermanium35 on both the front and back surfaces, enhancing its performance in the infrared spectrum. The coating is designed to reduce surface reflections, thereby increasing transmission and minimizing losses.