AL2018-A 20 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=18 mm; NA=0.49 AR 350-700nm

The AL2018-A is a high-precision aspheric lens, meticulously crafted by Thorlabs. This lens is designed with a diameter of 20 mm and a focal length of 18 mm, making it suitable for a wide range of optical applications. The lens is made from S-LAH64, a high-quality material from Ohara, ensuring durability and reliability.

The lens features a high numerical aperture (NA) of 0.49, which allows for a larger light-gathering capacity and improved resolution. The aspheric design of the lens reduces spherical aberration, providing superior image quality. The lens is also CNC polished, ensuring a smooth, high-quality surface finish.

The lens is coated with a broadband anti-reflective (AR) coating, which covers the wavelength range of 350-700 nm. This coating reduces surface reflections, enhancing the transmission of light through the lens. The coating is applied to both the front and back surfaces of the lens, ensuring optimal performance.

The lens has a thickness of 3.5 mm at the edge and 7.1 mm at the center. The inner and outer radii are 0 mm, indicating a circular shape. The lens also features a range of aspheric coefficients, including k1, k2, a2 front, a4 front, a6 front, a8 front, and a10 front, which contribute to its unique optical properties.