89-610 25mm Dia. Germanium Infrared Aspheric Lens; EFL=25mm; NA=0.5 BBAR 3-12µm

This is the 89-610 model from Edmund Optics, a 25mm diameter Germanium Aspheric Lens, specifically designed for infrared applications with a wavelength of 4000nm. The lens boasts an EFL (Effective Focal Length) of 25mm and a high numerical aperture (NA) of 0.5, making it ideal for imaging and light collection tasks in the infrared spectrum.

The lens is made from Germanium burnett, a material known for its excellent transmission properties in the infrared range. It features a BBAR (Broadband Anti-Reflection) coating on both the front and back surfaces, which further enhances its performance by reducing surface reflections and increasing transmission.

The lens geometry is intricately designed with an inner radius of 0mm, an outer radius of 0mm, and a thickness at the edge of 2.32mm. The center thickness is 3.45mm, and the lens has a base shape of a circle. The aspheric design of the lens helps to correct spherical aberration, a common issue in traditional lenses, thereby improving the overall image quality.

The lens comes with a front coating of "edm arcedgermanium31" and a back coating of the same, ensuring optimal performance and durability. The lens is currently in stock and available for immediate purchase through the provided weblink.