49-954-INK 15 mm Dia. N-BK7/N-SF5 Achromatic Doublet; EFL=60mm VIS-NIR 400-1000nm

The 49-954-INK is a high-quality achromatic doublet lens, sourced from the renowned optical vendor, Edmund Optics. This lens, with a diameter of 15 mm, is designed for use in the visible (VIS) and near-infrared (NIR) spectrum, specifically catering to the wavelength range of 400-1000nm.

The lens features a focal length (EFL) of 60mm, making it suitable for a wide range of optical applications. The achromatic design of this doublet lens ensures that it effectively compensates for chromatic aberration, a common issue in optical systems where different wavelengths of light are focused at different points.

The lens is composed of two elements, the first being N-BK7 from Schott, a popular crown glass known for its excellent optical properties. The second element is N-SF5 from Schott, a dense flint glass often used in achromatic doublets due to its high refractive index and dispersion.

The lens is coated with EDm VIS-NIR 0SP200-2000, a proprietary coating from Edmund Optics that enhances its performance in the VIS-NIR spectrum. The coating is applied to both the front and back surfaces of the lens, ensuring optimal light transmission and reducing surface reflections.

The geometry of the lens includes a thickness of 4.37mm at the edge, a center thickness of 3.5mm, and a central thickness 'a' of 2mm. The lens's inner and outer radii are 0, indicating a simple, circular shape. The radii of curvature for the first and second surfaces are 37.23mm and -26.69mm, respectively, while the third surface has a radius of curvature of -76.36mm.