45-803 25 mm Dia. N-LAK22/N-SF6 Achromatic Doublet; EFL=50mm NIR II 750-1550nm

The 45-803 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and a focal length of 50 mm, specifically designed for use in the near-infrared spectrum, covering the wavelength range of 750-1550 nm. This lens is sourced from the renowned optical vendor, Edmund Optics, and is available for purchase through their website.

The lens is constructed from two types of Schott glass, N-LAK22 and N-SF6, which are carefully selected and arranged to minimize chromatic aberration, a common issue in optical systems. The geometry of the lens is meticulously designed, with an inner radius of 0 mm, an outer radius of 0 mm, and a central thickness of 8 mm. The edge thickness is 8.94 mm, and the lens features a front curvature radius (r1) of 31.69 mm and a back curvature radius (r2) of -28.45 mm. The lens also includes an additional curvature (r3) of -161.05 mm, contributing to its superior optical performance.

The 45-803 lens is coated with Edmund Optics' standard NIR-II coating on both the front and back surfaces, ensuring optimal transmission and minimal reflection across the entire NIR-II spectrum. This coating is applied using a precise and controlled process, resulting in a consistent and reliable performance.

In terms of shape, the 45-803 is a multiplet lens, which means it is composed of multiple individual lenses. This design allows for a high level of customization and optimization, making it suitable for a wide range of applications. Despite its complex construction, the lens maintains a compact form factor, making it a practical choice for many optical systems.