AC254-045-B 25.4 mm Dia. N-LAK22/N-SF6HT Unmounted Achromatic Doublet; EFL=45mm 650-1050nm

The AC254-045-B is a high-quality achromatic doublet lens, designed and manufactured by Thorlabs. This lens is specifically engineered for use within the 650-1050nm spectral range, making it ideal for a wide range of applications within this wavelength.

The lens features a 25.4mm diameter, ensuring a wide field of view and high light gathering capability. The lens is constructed from two materials, N-LAK22 and N-SF6HT, both from Schott, which are renowned for their optical quality and durability. The use of these materials ensures high transmission and low dispersion, resulting in high-quality images with minimal chromatic aberration.

The lens has a focal length of 45mm, as indicated by the EFL (Effective Focal Length) parameter. This, combined with the large diameter, makes the lens suitable for use in a variety of optical systems, including microscopy, beam shaping, and imaging systems.

The lens is coated with Thorlabs' proprietary AC650-1050-B coating on both the front and back surfaces. This coating is designed to enhance the lens' performance within the 650-1050nm spectral range, by increasing transmission and reducing reflection.

The lens is unmounted, allowing for easy integration into existing optical systems. However, it is important to note that the lens does have a thickness of 5.9mm at the edge and 7.8mm at the center, which should be taken into account when designing the optical system.