22-770 12.5mm Dia. Germanium Infrared Aspheric Lens; EFL=37.5mm; NA=0.16 Uncoated

This is a 12.5mm diameter germanium aspheric lens, catalog number 22-770, sourced from the renowned optical vendor, Edmund Optics. The lens is designed for infrared applications with a wavelength of 8000nm. It boasts an effective focal length (EFL) of 37.5mm and a numerical aperture (NA) of 0.16, making it suitable for a wide range of optical systems.

The lens is uncoated, which means it does not have any additional layers to enhance its optical properties. However, this also implies that it may have higher reflectivity compared to coated lenses, especially at the extremes of the infrared spectrum. The lens's geometry includes an inner radius of 0mm, an outer radius of 0mm, a thickness at the edge of 2.83mm, and a thickness at the center of 3mm.

The lens's aspheric design, characterized by its radii (r1: 112.753mm, r2: 0mm), and conic constant (k1: -0.9), provides improved optical performance over traditional spherical lenses. This is particularly beneficial in systems requiring high resolution and low distortion.

Please note that the lens's front surface has a very small sagitta (e front: -6.513822e-07mm), curvature (f front: 1.571626e-10mm), and conic constant (g front: 0mm), which are essentially negligible. The lens also has no tilt (h front: 0mm) or decenter (j front: 0mm) in the front surface, and no power in the lens (l front: 0mm).

This lens is currently in stock, and you can find more information, including pricing and availability, on the Edmund Optics website using the provided weblink.