24-289 25mm Dia. Silicon Aspheric Lens; EFL=25mm; NA=0.5 BBAR 1650-3000nm

This is a 25mm diameter aspheric lens, catalog number 24-289, offered by Edmund Optics. It boasts a broadband anti-reflection (BBAR) coating suitable for wavelengths between 1650 and 3000nm. The lens is designed with a focal length (EFL) of 25mm and a numerical aperture (NA) of 0.5, making it a versatile choice for various optical applications.

The lens's geometry is intricately designed with an inner radius of 0 and an outer radius also at 0. The thickness at the edge is 2.44mm, while the center thickness is 3.8mm. The front and back surfaces of the lens are coated with BBAR 1650-3000si, providing excellent anti-reflection properties.

The lens's aspheric shape, defined by the parameters k1 (-1.712056) and k2 (0), ensures superior optical performance compared to traditional spherical lenses. This makes it an ideal choice for applications requiring high precision and minimal aberration.

The lens is available directly from Edmund Optics, and the provided weblink indicates that it is currently in stock. With its robust specifications and reliable performance, this lens is a valuable addition to any optical system.