AL1225M-C 12.5 mm Dia. N-BK7 High-Precision; CNC Polished Aspheric Lenses; EFL=25 mm; NA=0.23 AR 1050-1700nm

The AL1225M-C is a high-precision aspheric lens offered by Thorlabs, a leading vendor in the optical industry. This lens, with a diameter of 12.5 mm, is crafted from N-BK7, a renowned glass type from Schott, ensuring high-quality optical performance.

The lens's geometry is meticulously designed, featuring an inner radius of 0 mm, an outer radius of 0 mm, and a center thickness of 4 mm. The edge thickness is 2.5 mm, and the effective focal length (EFL) is 25 mm, making it suitable for various optical applications.

The lens's asphere is defined by its radii (r1: 12.78 mm, r2: 0 mm), and its conic constant (k1: -0.6). The aspheric coefficients include a2 front (0), a4 front (1.8429898e-06), a6 front (-3.8172252e-09), a8 front (-2.4345457e-11), a10 front (3.1730496e-14), a12 front (-3.700237e-15), and a14 front (6.5107821e-17), a16 front (-4.9604147e-19). These precise specifications enable the lens to correct spherical aberration, improving imaging quality.

The lens's numerical aperture (NA) is 0.23, indicating a wide acceptance angle and high light-gathering capability. The lens is coated with a broadband anti-reflection coating, optimized for the 1050-1700 nm range, reducing surface reflections and enhancing transmission.