AC254-300-A 25.4 mm Dia. N-BK7/SF2 Unmounted Achromatic Doublet; EFL=300.2mm 400-700nm

The AC254-300-A is a high-quality achromatic doublet lens, sourced from the renowned optical component manufacturer, Thorlabs. This lens, with a diameter of 25.4 mm, is designed for use in the 400-700nm spectral range, making it suitable for a wide range of applications in the visible spectrum.

The lens is constructed from two types of glass, N-BK7 and SF2, both from Schott's extensive catalog. These materials are chosen for their excellent optical properties, including low dispersion and high transmission in the visible spectrum. The lens features a doublet design, which is a type of multiplet, to correct chromatic aberrations, ensuring high-quality imaging.

The lens has a focal length of 300.2mm, as determined by its effective focal length (EFL). This long focal length makes the lens suitable for applications requiring high magnification or narrow fields of view. The lens's geometry includes a thickness of 5.4mm at the edge, with the central thickness varying between 4mm and 2mm. This variation in thickness is designed to further correct optical aberrations.

The lens is coated with Thorlabs' proprietary AC400-700-A coating on both the front and back surfaces. This coating is designed to enhance the lens's transmission in the 400-700nm range, reducing losses due to reflection and increasing the overall efficiency of the optical system.