68-012 12mm Dia. x -18mm FL; NIR II Coated; Double-Concave Lens 750-1550nm

The 68-012 is a double-concave lens with a diameter of 12mm and a focal length of -18mm, making it a negatively powered lens. This lens is sourced from Edmund Optics, a reputable vendor known for its high-quality optical elements. The lens is designed for use in the near-infrared (NIR) spectrum, specifically between 750nm and 1550nm, making it suitable for various applications in this range.

The lens is made from N-BK7 Schott, a popular optical glass due to its excellent optical properties and versatility. The lens features a standard curve coating on both the front and back surfaces, specifically the EDM NIR-II coating. This coating is designed to enhance the lens' performance in the NIR spectrum, providing improved transmission and reduced reflection.

The geometry of the lens includes a center thickness of 2mm and an edge thickness of 3.76mm. The inner and outer radii are not specified, indicating that they are not a significant factor in the lens' performance or application. The lens' shape is spherical, which is the most common type of lens due to its ease of manufacturing and versatile applications.

The lens' parameters suggest that it is designed for use in systems where a negative lens is required. This could include applications such as beam expansion, collimation, or image reduction. The NIR coating and the lens' material make it suitable for use in applications such as night vision, thermal imaging, or spectral analysis.