AL1225M-B 12.5 mm Dia. N-BK7 High-Precision; CNC Polished Aspheric Lenses; EFL=25 mm; NA=0.23 AR 650-1050nm

The AL1225M-B is a high-precision aspheric lens offered by Thorlabs, a leading vendor in the optical industry. This lens, designed with a circular base shape, is crafted from N-BK7 Schott glass, a material known for its excellent optical properties.

The lens has a diameter of 12.5 mm and a thickness of 2.5 mm at the edge, ensuring robustness and durability. The effective focal length (EFL) is 25 mm, making it suitable for a wide range of optical applications. The lens's front surface has a radius of curvature (R1) of 12.78 mm, while the back surface (R2) is flat.

The lens's thickness at the center is 4 mm, and it features a high numerical aperture (NA) of 0.23, enhancing its light-gathering capability. The lens's conic constant (k1) is -0.6, and it has a series of aspheric coefficients (a2 to a16) that contribute to its unique optical performance.

The lens is coated with a broadband anti-reflection coating, optimized for the 650-1050 nm wavelength range, reducing surface reflections and improving transmission. This lens, with its aspheric design, offers superior image quality and minimizes spherical aberration, making it an excellent choice for various optical systems.