47-317 50 mm Dia. N-LAK22/N-SF6 Achromatic Doublet; EFL=100mm NIR II 750-1550nm

The 47-317 is a high-quality achromatic doublet lens, boasting a 50 mm diameter and an effective focal length (EFL) of 100 mm, specifically designed for use in the near-infrared (NIR) 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. This achromatic design ensures that the lens focuses different wavelengths of light onto the same point, delivering sharp and clear images across the entire NIR spectrum.

The 47-317 features a robust geometry, with a thickness of 13.89 mm at the edge and 14.5 mm at the center. The lens also includes a central thickness 'a' of 5.5 mm, providing additional structural integrity. The inner and outer radii of the lens are 0 mm, indicating a circular shape that maximizes the light-gathering capability.

The lens is coated with Edmund Optics' standard NIR-II coating on both the front and back surfaces. This coating is specifically designed to enhance the performance of the lens in the NIR spectrum, ensuring high transmission and minimal reflection.