69-645 25mm Dia. x 250mm FL; Uncoated; Ge Plano-Convex Lens

The 69-645 is a 25mm diameter, 250mm focal length plano-convex lens, sourced from Edmund Optics. This lens, made of germanium burnett, is uncoated and features a spherical shape. The lens's geometry includes a 2.9mm thickness at the edge, increasing slightly to 3mm at the center, with an effective focal length (EFL) of 250mm. The lens's inner and outer radii are both zero, and it has a 750.97mm radius of curvature (R1). The back focal length (BFL) is 249.25mm.

The lens is designed to operate at a wavelength of 10600nm. It is important to note that this lens is uncoated, which may affect its performance in certain applications, particularly those requiring high transmission or resistance to environmental factors. However, uncoated lenses can offer advantages such as lower cost and simpler fabrication.

This lens is a versatile option for a variety of optical applications, thanks to its robust construction and high-quality materials. Its plano-convex design allows for efficient light transmission and focusing, making it suitable for use in imaging systems, beam shaping, and other applications where precise optical control is required.