AL1512 15 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=12 mm; NA=0.55 Uncoated

The AL1512 is a high-precision aspheric lens offered by Thorlabs, designed with a 15 mm diameter and a NA (Numerical Aperture) of 0.55. This lens is made from S-LAH64, a high-quality optical glass from Ohara, which ensures excellent optical performance. The lens's design includes a polished aspheric surface, providing improved imaging quality over spherical lenses by reducing spherical aberration.

The lens's geometry includes an effective focal length (EFL) of 12 mm, an inner radius of 0 mm, and an outer radius of 0 mm. The thickness at the edge is 2.1 mm, while the center thickness is 5.3 mm. The aspheric surface is defined by a conic constant of -1, with aspheric coefficients a2, a4, a6, a8, a10, a12, a14, and a16, which are 0, 5.7598697e-05, -2.503422e-08, -6.7519988e-10, -2.0018474e-12, 3.8684828e-15, 1.2447477e-16, and -3.659331e-19, respectively.

The AL1512 lens does not come with any coating, as indicated in the item data. However, coatings can be added to enhance the lens's performance, such as anti-reflective coatings to reduce surface reflections or protective coatings to increase durability.