67-980 3.0mm Dia. x -9 FL; NIR II Coated; Plano-Concave Lens 750-1550nm

The 67-980 is a 3.0mm diameter Plano-Concave Lens with a -9 FL (focal length) and a -7.06mm radius of curvature on the front surface. This lens is sourced from Edmund Optics, a reputable vendor in the optical industry, and is available for purchase on their official website. The product link provided in the item data indicates that the lens is currently in stock, ensuring prompt delivery upon order placement.

The lens is constructed from n-SF11 Schott, a high-index glass material with excellent optical properties, particularly in the near-infrared (NIR) region. The lens features a NIR II coating on both the front and back surfaces, specifically the EDM NIR-II STD curve. This coating enhances the lens's performance in the NIR spectrum, specifically between 750-1550nm, making it suitable for applications such as night vision, thermal imaging, and spectral analysis.

The lens has a thickness of 1.11mm at the edge and 1mm at the center, providing a robust yet compact design. The back focal length (BFL) is -9.56mm, and the effective focal length (EFL) is -9mm. The lens does not have an inner or outer radius, indicating a uniform curvature across the surface.