45-801 25 mm Dia. N-LAK22/N-SF6 Achromatic Doublet; EFL=40mm NIR II 750-1550nm

The 45-801 is a high-quality achromatic doublet lens, boasting a 25 mm diameter and an effective focal length of 40mm, specifically designed for use in the near-infrared spectrum (NIR II) range of 750-1550nm. 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 a thickness of 11.09mm at the edge and 11mm at the center, ensuring optimal light transmission and image quality.

The lens features a sophisticated coating strategy, with both the front and back surfaces coated with Edmund Optics' standard NIR-II curve. This coating enhances the lens's performance in the NIR II spectrum, providing superior image quality and reducing unwanted reflections.

The 45-801 is a multiplet lens, meaning it is composed of multiple elements. This design allows for more precise control over the optical properties of the lens, resulting in improved image quality and performance. The lens's base shape is circular, contributing to its compact design and ease of integration into various optical systems.