AC508-250-B 50.8 mm Dia. N-BAF10/N-SF6HT Unmounted Achromatic Doublet; EFL=250mm 650-1050nm

The AC508-250-B is a high-quality achromatic doublet lens, unmounted and with a diameter of 50.8 mm, sourced from the renowned optical component manufacturer, Thorlabs. This lens is designed for use within the spectral range of 650-1050nm, making it suitable for a wide variety of applications within this range.

The lens features a geometry that includes an outer radius of 0mm, an inner radius also of 0mm, and a thickness at the edge of 6.8mm. The first radius of curvature (r1) is 121.2mm, the second radius of curvature (r2) is -146.1mm, and the third radius of curvature (r3) is 1235.9mm. The thickness at the center (1) is 6.6mm and at the center (2) is 2.6mm.

The lens is composed of two materials, both from the reputable Schott glass catalog. The first material, used for the front part of the lens, is n-baf10. The second material, used for the back part of the lens, is n-sf6ht. Both materials have been specifically chosen for their optical properties within the intended wavelength range.

The lens is coated with a broadband anti-reflection coating, specifically the THORLABS AR650-1050 Broadband Coating (THO AC650-1050-B), on both the front and back surfaces. This coating enhances the lens's performance by reducing surface reflections, thereby increasing transmission and minimizing losses.