AC254-400-C 25.4 mm Dia. N-SF2/N-SF6 Unmounted Achromatic Doublet; EFL=400.1mm 1050-1700nm

The AC254-400-C is a high-quality achromatic doublet lens from Thorlabs, designed for use in the 1050-1700nm spectral range. This lens, with a diameter of 25.4mm, is part of Thorlabs' extensive catalog of optical elements, which includes a wide variety of lenses, mirrors, and beam splitters, among other components.

The lens is a multiplet, meaning it is composed of multiple elements to achieve superior optical performance. The geometry of the lens is carefully designed, with an edge thickness of 6.1mm and a central thickness of 4.2mm for the first element, and 2.5mm for the second. The lens features radii of curvature of 70mm, -93.1mm, and 151.4mm for the first, second, and third surfaces, respectively, providing excellent imaging quality.

The lens is made from Schott N-SF2 and N-SF6 glass, which are chosen for their excellent optical properties in the near-infrared region. The lens is coated with Thorlabs' AC1050-1700-C coating, which is specifically designed for use in the 1050-1700nm range, ensuring high transmission and low reflectance.

The lens is unmounted, providing users with the flexibility to integrate it into their own optical systems. The catalog number for this lens is AC254-400-C, and it is currently in stock on Thorlabs' website. The link to the product page is provided for convenience.