AL2550-C 25 mm Dia. S-LAH64 High-Precision; CNC Polished Aspheric Lenses; EFL=50 mm; NA=0.23 AR 1050-1700nm

The AL2550-C is a high-precision aspheric lens offered by Thorlabs, a leading vendor in the optical industry. This lens, with a catalog number AL2550-C, is specifically designed for use in the 780 nm wavelength range. The lens is made of n-bk7 schott, a high-quality optical glass known for its excellent transmittance and low auto-fluorescence.

The lens features a circular base shape with a diameter of 25 mm and a thickness of 3 mm at the edge. The effective focal length (EFL) of this lens is 50 mm, making it suitable for a wide range of optical applications. The lens's front surface has a radius of curvature (R1) of 25.56 mm, while the back surface (R2) is flat. The center thickness of the lens is 6 mm, and it has a numerical aperture (NA) of 0.23.

The AL2550-C lens boasts an aspheric shape, which is particularly advantageous in systems where imaging quality is critical. The aspheric design helps to reduce spherical aberration, coma, and other optical aberrations, thereby improving the overall image quality. The lens's aspheric surface is CNC polished, ensuring high surface accuracy and excellent optical performance.

The lens is coated with tho c bbar on both the front and back surfaces. This anti-reflection coating is designed to minimize surface reflections and increase transmission in the 1050-1700 nm range. The coating also provides protection against environmental factors, ensuring the longevity of the lens.