67-634 15mm Dia. x 45mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

The 67-634 is a high-quality double-convex lens, 15mm in diameter and 45mm in focal length, designed for use in the near-infrared (NIR) spectrum. This lens is sourced from Edmund Optics, a leading provider of optical components, and is available for purchase directly from their website.

The lens is made from n-BK7 Schott, a popular optical glass due to its excellent transparency in the visible and near-infrared regions. It features a standard NIR-II coating on both the front and back surfaces, which enhances its performance in the 750-1550nm wavelength range. This coating is designed to reduce surface reflections, thereby increasing transmission and improving overall image quality.

The geometry of the lens includes a 1.77mm edge thickness and a 3mm center thickness. The front and back radii are 45.99mm and -45.99mm respectively, while the back focal length is 44mm. The lens has no inner or outer radius, indicating a uniform thickness across its surface.

This lens is a spherical lens, meaning it has a surface that is a portion of a sphere. This shape is commonly used in optical systems due to its simplicity and the ability to focus light to a point. The double-convex design, where both surfaces are convex, further enhances the lens's ability to focus light, making it suitable for a wide range of applications.