AL1815-A 18 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=15 mm; NA=0.53 AR 350-700nm

The AL1815-A is a high-precision aspheric lens, meticulously crafted by Thorlabs. This lens boasts a diameter of 18 mm and is constructed from S-LAH64, a material renowned for its exceptional optical properties. The lens is designed for use with a wavelength of 780 nm, making it suitable for a wide range of applications.

The lens features an effective focal length (EFL) of 15 mm, which is a crucial parameter in lens selection. The EFL determines the lens's magnification power and is a key factor in determining the overall optical system's performance.

The AL1815-A also boasts a high numerical aperture (NA) of 0.53. The NA is a measure of the lens's ability to gather light and is directly related to the lens's resolving power. A higher NA allows for a higher resolution, making this lens ideal for high-resolution applications.

The lens's geometry is another notable feature. It has an inner radius of 0 mm and an outer radius of 0 mm, indicating a circular shape. The lens's thickness at the edge is 2.5 mm, while its center thickness is 6.2 mm. The lens's front surface is defined by a conic constant of -1.1 and aspheric coefficients of a2: 0, a4: 3.6906721e-05, a6: -1.2854612e-08, a8: -1.4001677e-10, a10: -2.5131166e-13, a12: 5.0178988e-16, a14: 5.8558715e-18, and a16: -1.1277944e-20.

The lens is coated with a broadband anti-reflection (AR) coating, optimized for the 350-700 nm range. This coating reduces unwanted reflections, improving the lens's transmission and overall system performance.