67-638 18mm Dia. x 27mm FL; NIR II Coated; Double-Convex Lens NIR II 750-1550nm

This is a 67-638 double-convex lens, 18mm in diameter and 27mm in focal length, specifically designed for use in the near-infrared (NIR) spectrum, covering the wavelength range of 750-1550nm. The lens is sourced from the reputable optical vendor, Edmund Optics, and is currently in stock, as indicated by its weblink status.

The lens is made of N-BK7 Schott, a popular optical glass due to its excellent transparency in the visible and near-infrared regions. It features a standard curve coating on both the front and back surfaces, specifically the EDM NIR-II coating, which is designed to enhance its performance in the NIR spectrum.

The lens's geometry includes a diameter of 18mm, a thickness at the edge of 2.42mm, and a center thickness of 5.5mm. The effective focal length (EFL) is 27mm, and the radii of curvature for the first and second surfaces are 27.08mm and -27.08mm, respectively. The back focal length (BFL) is 25.25mm, and both the inner and outer radii are 0mm.

This lens is a spherical lens with a circular base shape, making it suitable for a wide range of optical applications. Its NIR coating and double-convex design make it an ideal choice for applications that require high-quality imaging or light transmission in the near-infrared spectrum.