38-400-INK 12.5mm Dia. x 20mm FL; NIR II; Inked; Plano-Convex Lens NIR II 750-1550nm

The 38-400-INK is a Plano-Convex lens, sourced from Edmund Optics, designed for use within the near-infrared (NIR) spectrum, specifically between 750nm and 1550nm. This lens boasts a diameter of 12.5mm and a focal length of 20mm, making it a compact yet powerful addition to any optical system.

The lens is constructed from n-SF11 Schott glass, a material renowned for its excellent transmission properties within the NIR spectrum. This, coupled with the lens's plano-convex geometry, allows for efficient light collection and transmission, making it ideal for applications such as night vision, thermal imaging, and spectral analysis.

The 38-400-INK features a standard curve coating on both the front and back surfaces, specifically the EDM NIR-II coating. This coating is designed to enhance the lens's performance within the NIR spectrum, reducing surface reflections and improving overall transmission.

The lens has a center thickness of 3.1mm and an edge thickness of 1.3mm, providing a robust yet lightweight design. The inner and outer radii are 0mm, indicating a uniform curvature across the lens surface. The effective focal length (EFL) is 15mm, and the back focal length (BFL) is 13.26mm, providing a long focal length relative to its size.