AC254-250-B-ML 25.4 mm Dia. SF5/N-SF6HT Mounted Achromatic Doublet; EFL=250mm 650-1050nm

The AC254-250-B-ML is a mounted achromatic doublet lens, designed and manufactured by Thorlabs. This lens is specifically engineered for use within the spectral range of 650-1050nm, making it suitable for a variety of applications within this range.

The lens features a diameter of 25.4mm, providing a substantial surface area for light transmission. The edge thickness of the lens is 4.7mm, contributing to its robustness and durability. The lens's geometry is complex, with three radii of curvature (r1, r2, and r3) and two central thicknesses, which are 52mm, -65.31mm, 111.51mm, 4mm, and 1.5mm respectively. This complex geometry is designed to optimize the lens's performance in its specified spectral range.

The lens is composed of two materials, SF5 and N-SF6HT, both from Schott. These materials are chosen for their optical properties, which contribute to the lens's overall performance. The lens is coated with Thorlabs' AC650-1050-B coating on both the front and back surfaces, further enhancing its performance within the specified spectral range.

The lens is mounted, which adds to its convenience and ease of use. The mounting ensures the lens is securely positioned, reducing the risk of damage during handling and use. The mount also facilitates easy integration of the lens into optical systems.