AC254-040-B 25.4 mm Dia. N-BAF10/N-SF6HT Unmounted Achromatic Doublet; EFL=40mm 650-1050nm

The AC254-040-B is a high-quality unmounted achromatic doublet lens, designed and manufactured by Thorlabs. This lens is specifically engineered for use within the spectral range of 650-1050nm, making it ideal for a wide range of applications within this wavelength range.

The lens features a base shape of a circle, with a diameter of 25.4mm. The edge thickness of the lens is 8.6mm, while the inner and outer radii are 0mm. The lens's first radius of curvature (r1) is 26.12mm, the second radius (r2) is -21.28mm, and the third radius (r3) is -137.09mm. The center thickness of the lens is 10mm for the first section and 2.5mm for the second.

The lens is composed of two materials: N-BAF10 and N-SF6HT, both from Schott. These materials are chosen for their excellent optical properties within the specified wavelength range. The lens is coated with Thorlabs' proprietary AC650-1050-B coating on both the front and back surfaces, further enhancing its performance and durability.

The lens is a multiplet, meaning it is composed of multiple elements. This design allows for the correction of chromatic aberrations, ensuring high-quality imaging across the entire spectral range. The lens is unmounted, providing users with the flexibility to integrate it into their own systems and setups.

According to Thorlabs' website, the lens is currently in stock, making it readily available for immediate use. The catalog number for the lens is AC254-040-B, and more information can be found on Thorlabs' website using this number.