The 67-631 is a high-quality double-convex lens, 15mm in diameter and with a focal length of 22.5mm, sourced from the renowned optical vendor, Edmund Optics. This lens is specifically designed for use in the near-infrared (NIR) spectrum, with a coating optimized for the NIR II range of 750-1550nm.
The lens is made from n-SF11 Schott, a high-index glass with excellent transmittance in the NIR region. The double-convex geometry, with radii of curvature of 34.36mm for both the front and rear surfaces, provides a high level of optical power and a compact form factor. The edge thickness is 2.54mm, while the center thickness is 4.2mm, ensuring robustness and durability.
The lens features a standard anti-reflection coating on both the front and back surfaces, specifically the EDM NIR-II STD curve. This coating is designed to minimize surface reflections and increase transmission in the NIR II range, enhancing the performance of the lens in its intended application.