67-994 12mm Dia. x -24 FL; NIR II Coated; Plano-Concave Lens 750-1550nm

The 67-994 is a Plano-Concave Lens with a 12mm diameter and a focal length of -24, sourced from Edmund Optics. This lens is designed for use in the near-infrared (NIR) spectrum, specifically between 750 and 1550nm, making it suitable for a wide range of applications in this region.

The lens is made from N-BK7 Schott glass, a popular choice for its high homogeneity, low optical dispersion, and excellent transmission properties in the visible and NIR spectra. The lens features a plano-concave geometry, meaning one side is flat while the other is curved inward. This design is often used to correct aberrations and improve image quality.

The 67-994 lens comes with a standard NIR-II coating on both the front and back surfaces. This coating is designed to enhance the lens's performance in the NIR spectrum by reducing surface reflections and improving transmission. The coating is part of Edmund Optics' standard curve, ensuring consistent performance across different lenses.

The lens has a thickness of 4.79mm at the edge and 3.5mm at the center. The inner and outer radii are not specified, indicating that the lens does not have any additional shaping beyond its plano-concave geometry.