67-639 18mm Dia. x 36mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

Discover the 67-639, a high-performance double-convex lens, designed and manufactured by Edmund Optics. This lens boasts an 18mm diameter and a 36mm focal length, making it a versatile choice for a wide range of applications.

The lens is crafted from n-BK7 Schott, a high-quality optical glass known for its excellent transparency and low dispersion. This material ensures superior image quality and color fidelity, making it an ideal choice for applications that demand high optical performance.

The 67-639 features a double-convex geometry, with radii of curvature of 36.6mm and -36.6mm for the front and back surfaces, respectively. This geometry provides a large numerical aperture, enhancing the lens' light-gathering capability and improving its performance in low-light conditions.

The lens is coated with Edmund Optics' NIR-II standard curve coating on both the front and back surfaces. This coating is specifically designed to enhance the lens' performance in the near-infrared spectrum, between 750nm and 1550nm. It ensures high transmission and low reflectance, maximizing the amount of light that passes through the lens and reducing unwanted reflections.

With a center thickness of 4.8mm and an edge thickness of 2.55mm, the 67-639 offers a robust and durable design. Its back focal length of 34.59mm ensures easy integration into optical systems, while its clear aperture of 18mm provides a wide field of view.