The 49-526 is a Plano-Concave Lens with a diameter of 12.0mm, a focal length of -15, and a central thickness of 3.0mm, which gradually increases to 4.47mm towards the edge. This lens is sourced from Edmund Optics and is currently in stock.
The lens is made from n-sf11 Schott, a high-index glass with excellent transmittance in the near-infrared (NIR) region. The NIR I coating, applied to both the front and back surfaces, enhances the lens's performance in this spectral range, typically between 600-1050nm. This coating is standard for Edmund Optics and provides a high transmission and low reflectance, making it ideal for NIR applications.
The lens's geometry is spherical, with a radius of curvature of -11.77mm on the concave surface. The back focal length is -16.68mm, and the lens has no inner or outer radii, indicating a simple, plano-concave design.