AC300-050-A 30 mm Dia. N-BAF10/N-SF6HT Unmounted Achromatic Doublet; EFL=50mm 400-700nm

The AC300-050-A is a high-quality, unmounted achromatic doublet lens from Thorlabs, designed for use in the 400-700nm spectral range. This lens, with a diameter of 30 mm, is a multiplet type, featuring a complex geometry that ensures superior optical performance.

The lens is composed of two types of Schott glass, N-BAF10 and N-SF6HT, each with specific refractive indices and dispersions that contribute to the lens's achromatic design. This design ensures that the lens minimizes chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

The lens has a specified effective focal length (EFL) of 50mm, which is the distance from the lens's principal point to the focal point where light rays converge. This EFL makes the lens suitable for a wide range of optical applications, including imaging, beam shaping, and laser systems.

The lens's geometry includes a thickness of 6.3mm at the edge, with the inner and outer radii being 0. The radii of curvature for the three surfaces are r1=34, r2=-29.4, and r3=-161.5. The thickness at the center of the first and second surfaces is 8.5mm and 2mm, respectively.

The lens is coated with Thorlabs' AC400-700-A coating on both the front and back surfaces. This anti-reflection coating is designed to reduce surface reflections and increase transmission in the 400-700nm spectral range, further enhancing the lens's performance.