AC064-015-B 6.35 mm Dia. N-LAK22/N-SF6HT Unmounted Achromatic Doublet; EFL=15mm 650-1050nm

The AC064-015-B is an unmounted achromatic doublet lens, a high-quality optical component designed and manufactured by Thorlabs. This lens is specifically designed for use within the spectral range of 650-1050nm, making it suitable for a wide range of applications in the near-infrared region.

The lens features a base shape of a circle, with a diameter of 6.35mm. The edge thickness of the lens is 3.2mm, while the inner and outer radii are 0mm each. The lens's first radius of curvature (r1) is 10.3mm, the second radius (r2) is -7.8mm, and the third radius (r3) is -32.9mm. The center thickness of the first and second surfaces of the lens is 2.4mm and 1.5mm, respectively.

The lens is made from two types of materials: N-LAK22 from Schott and N-SF6HT from Schott. These materials are chosen for their excellent optical properties within the specified spectral range. The lens is coated with a broadband anti-reflection coating, specifically the THo AR650-1050-B coating, on both the front and back surfaces. This coating enhances the lens's performance by reducing surface reflections and increasing transmission.

The lens's shape is a multiplet, which means it is composed of multiple elements. This design helps to correct chromatic aberrations, making the lens suitable for achromatic applications. The effective focal length (EFL) of the lens is 15mm, which is a common focal length for many optical systems.