AL2018-B 20 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=18 mm; NA=0.49 AR 650-1050nm

The AL2018-B is a high-precision aspheric lens offered by Thorlabs, a leading global manufacturer of photonics equipment. This lens, crafted from S-LAH64 Ohara, boasts a 20 mm diameter and a center thickness of 7.1 mm, with an edge thickness of 3.5 mm. The lens's design includes an effective focal length (EFL) of 18 mm, a numerical aperture (NA) of 0.49, and a radii of curvature of 13.98 mm and 0 mm for the front and back surfaces, respectively.

The lens's aspheric shape is defined by a conic constant of -1.4 and aspheric coefficients up to the 16th order. This complex shape allows for superior image quality and minimal spherical aberration compared to traditional spherical lenses. The lens's anti-reflection (AR) coating, designed for the 650-1050 nm wavelength range, further enhances its performance by reducing surface reflections and increasing transmission.

This lens is suitable for a wide range of applications, including but not limited to, beam shaping, focusing, and imaging in various fields such as biomedical research, machine vision, and material processing. The lens's robust construction, high precision, and excellent optical performance make it a valuable addition to any optical system.