AL2520-A 25 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=20 mm; NA=0.54 AR 350-700nm

The AL2520-A is a high-precision aspheric lens offered by Thorlabs, a leading vendor in the optical industry. This lens is characterized by its 25 mm diameter and is designed for use with a wavelength of 780 nm. The lens is made from S-LAH64, a high-quality material from Ohara, ensuring excellent optical performance.

The lens features an effective focal length (EFL) of 20 mm, making it suitable for a wide range of optical applications. It has a high numerical aperture (NA) of 0.54, which allows for a larger light-gathering capacity and improved resolution. The lens is also coated with an anti-reflective (AR) coating, specifically designed for the 350-700 nm range, which reduces surface reflections and increases transmission.

The AL2520-A is CNC polished, ensuring a high level of precision and surface quality. The lens has a center thickness of 7.6 mm and an edge thickness of 2.4 mm, providing structural rigidity and resistance to deformation. The lens's front and back surfaces are coated with the same AR coating, ensuring consistent performance across the entire optical path.