AC127-075-AB 12.7 mm Dia. N-BK7/N-SF2 Unmounted Achromatic Doublet; EFL=75mm 400-1100nm

The AC127-075-AB is a high-quality, unmounted achromatic doublet lens from Thorlabs, designed for use in the 400-1100nm wavelength range. This lens, with a diameter of 12.7 mm, is a multiplet type, featuring a complex geometry that includes three radii of curvature and two different materials.

The lens is composed of two materials: N-BK7 from Schott and N-SF2 from Schott. These materials are chosen for their excellent optical properties, including low dispersion and high transmission across the specified wavelength range. The lens features a front coating of THo AB ACHROMATIC AR and a back coating of THo AB ACHROMATIC AR, which further enhance its performance by reducing surface reflections and improving transmission.

The geometry of the lens is carefully designed to correct chromatic aberrations, a common issue in optical systems. The lens has a first radius of curvature (r1) of 38.4 mm, a second radius of curvature (r2) of -35 mm, and a third radius of curvature (r3) of -177.3 mm. The edge thickness of the lens is 3.3 mm, while the center thicknesses are 2.5 mm and 1.5 mm.

The lens is currently in stock and available for immediate purchase from Thorlabs' website. With its high-quality materials, advanced coating, and sophisticated geometry, the AC127-075-AB is an excellent choice for a wide range of optical applications.