45-787 6 mm Dia. N-LAK22/N-SF6 Achromatic Doublet; EFL=25mm NIR II 750-1550nm

The 45-787 is a high-quality achromatic doublet lens, boasting a 6 mm diameter and an effective focal length of 25 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 directly from their website.

The lens is constructed from two types of Schott glass, N-LAK22 and N-SF6, which have been 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 3.95 mm at the edge, a central thickness of 3 mm, and a central thickness 'a' of 1.3 mm. The lens features three radii of curvature: r1 at 13.95 mm, r2 at -13.4 mm, and r3 at -193.19 mm, which contribute to its excellent optical performance.

The 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 spectral range. This coating is a crucial feature for applications that require high-quality imaging or sensing in the near-infrared spectrum.