67-670 40mm Dia. x 120mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

The 67-670 is a high-quality double-convex lens, designed and manufactured by Edmund Optics, a leading global provider of optical components. This lens boasts a 40mm diameter and a focal length of 120mm, making it suitable for a wide range of applications that require precise optical performance.

The lens is constructed from N-BK7 Schott glass, a material known for its excellent optical properties and versatility. This glass is particularly well-suited for use in the visible and near-infrared spectrum, making the 67-670 an ideal choice for applications in this range.

The 67-670 features a standard NIR II coating on both the front and back surfaces. This coating is specifically designed to enhance the lens' performance in the near-infrared region, improving transmission and reducing unwanted reflections. The coating curve is the standard curve provided by Edmund Optics, ensuring consistent performance across their product range.

The lens geometry is characterized by its double-convex shape, with radii of curvature of 122.83mm for both the front and back surfaces. This shape provides a large numerical aperture, enhancing the lens' light-gathering capability and improving its performance in high-resolution applications.

The lens has an inner radius of 0mm and an outer radius of 0mm, indicating a uniform thickness across the lens. The edge thickness is 3.72mm, while the center thickness is 7mm, providing a robust and durable structure.

The effective focal length (EFL) of the lens is 117.67mm, slightly shorter than the nominal focal length due to the double-convex design. This EFL, combined with the large diameter and high-quality N-BK7 Schott glass, makes the 67-670 a versatile and high-performing optical component.