ACL2018U-B Ø20 mm Aspheric Condenser Lens; f=18.1 mm, NA=0.52 AR 650-1050nm

The ACL2018U-B is a high-quality aspheric condenser lens, designed and manufactured by Thorlabs. This lens is specifically engineered to optimize performance in a wide range of applications, particularly where high numerical aperture and excellent imaging quality are required.

The lens is constructed from B270 Schott glass, a material known for its excellent optical properties and durability. It features a diameter of 20 mm and a thickness of 1.8 mm at the edge, ensuring robustness and stability. The effective focal length of the lens is 18.1 mm, and it has a relatively high numerical aperture of 0.52, which is beneficial for applications requiring high light-gathering capabilities.

The ACL2018U-B is coated with broadband anti-reflective coatings, specifically designed for the 650-1050nm wavelength range. This coating significantly reduces surface reflections, thereby improving transmission and enhancing the overall performance of the lens.

The lens also features an aspheric surface, which helps to reduce spherical aberration and distortion, common issues in traditional spherical lenses. This results in improved image quality, making it ideal for critical imaging applications.