AC127-075-B 12.7 mm Dia. N-BAF10/N-SF6HT Unmounted Achromatic Doublet; EFL=75mm 650-1050nm

The AC127-075-B is a high-quality, unmounted achromatic doublet lens from Thorlabs, designed for use in the 650-1050nm spectral range. This lens is a multiplet, meaning it is composed of multiple optical elements to achieve superior performance.

The lens features a 12.7 mm diameter and a total thickness of 3.5 mm at the edge. The geometry of the lens is complex, with three radii of curvature (r1: 36.2, r2: -40.4, r3: 398.1) and varying thicknesses at the center (2.5 mm and 1.5 mm). This complex geometry is designed to minimize optical aberrations and provide sharp, clear images.

The lens is made from two types of Schott glass: N-BAF10 and N-SF6HT. These glasses were chosen for their specific refractive indices and dispersion properties, which allow the lens to effectively bring light to a focus while minimizing chromatic aberration. The lens is coated with Thorlabs' AC650-1050-B coating on both the front and back surfaces, which is designed to enhance transmission in the 650-1050nm range.

This lens is a versatile optical component, suitable for a wide range of applications including imaging, spectroscopy, and beam shaping. It is available for purchase directly from Thorlabs, and the provided weblink provides current pricing and availability information.