AL2520M 25 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=20 mm; NA=0.54 Uncoated

The AL2520M is a high-precision aspheric lens offered by Thorlabs, designed with a 25 mm diameter and a focal length of 20 mm. This lens is crafted from S-LAH64 Ohara, a high-refractive index material, which allows for a superior optical performance.

The lens's base shape is circular, and it boasts a high numerical aperture (NA) of 0.54, enabling excellent light-gathering capabilities. The aspheric design effectively minimizes spherical aberration, ensuring superior image quality and resolution.

The geometry of the AL2520M includes an inner radius of 0 mm, an outer radius of 0 mm, a thickness at the edge of 2.4 mm, and a center thickness of 7.6 mm. The lens's front surface is defined by the conic constant k1 (-1.35), while the aspheric coefficients a2, a4, a6, a8, a10, a12, a14, and a16 are 0, 2.3618134e-05, -1.1303079e-08, -1.1113906e-11, -2.3981714e-14, 3.035791e-17, 1.3660815e-19, and -1.8881587e-22, respectively.

The lens is uncoated, allowing users to apply their preferred coating based on their specific application requirements. The AL2520M is currently in stock and available for immediate shipping, as indicated by its weblink status.