AL2550-B 25 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=50 mm; NA=0.23 AR 650-1050nm

The AL2550-B is a high-precision aspheric lens offered by Thorlabs, a leading global manufacturer of photonics equipment. This lens, with a diameter of 25 mm, is designed for use with a wavelength of 780 nm and has an effective focal length (EFL) of 50 mm. The lens is made from n-BK7 Schott glass, a popular material for optical elements due to its excellent optical properties and durability.

The lens features a high numerical aperture (NA) of 0.23, which allows for a wide angle of acceptance and increased light-gathering capability. The aspheric design of the lens helps to reduce spherical aberration, a common issue in traditional spherical lenses, resulting in improved image quality and resolution.

The lens is CNC polished, ensuring a high level of surface accuracy and smoothness. It is coated with a broadband anti-reflection coating, specifically designed for the 650-1050 nm range, which reduces surface reflections and increases transmission, thereby enhancing the overall performance of the lens.

The lens has a center thickness of 6 mm and an edge thickness of 3 mm, providing structural rigidity and resistance to deformation. The lens is available for immediate purchase and is currently in stock on the Thorlabs website.