AC254-100-A-ML 25.4 mm Dia. N-BK7/SF5 Mounted Achromatic Doublet; EFL=100mm 400-700nm

The AC254-100-A-ML is a high-quality achromatic doublet lens from Thorlabs, designed with a 25.4 mm diameter and a focal length of 100mm. This lens is specifically engineered for use in the 400-700nm spectral range, making it ideal for a wide range of optical applications.

The lens is constructed from two types of glass: N-BK7 from Schott and SF5 from Schott. N-BK7, also known as Borosilicate Crown, is a popular optical glass due to its excellent optical properties and high damage threshold. SF5, on the other hand, is a High Index Flint glass with a refractive index significantly higher than that of N-BK7, making it an excellent choice for achromatic doublets.

The lens features a front coating of THo AC400-700-A, a broadband anti-reflection coating designed for use in the 400-700nm range. This coating reduces surface reflections, thereby increasing transmission and improving overall system performance. The back surface of the lens also features the same coating for consistent performance.

The lens geometry is carefully designed with a range of radii and thicknesses to achieve the desired optical performance. The edge thickness is 4.7mm, while the center thicknesses are 4mm and 2.5mm. The lens has a circular shape with no inner or outer radii, making it suitable for a wide range of applications.

In terms of availability, the lens is currently in stock, according to the vendor's website. The vendor, Thorlabs, is a reputable supplier of optical components, ensuring reliable and consistent quality.