67-997 20mm Dia. x -40 FL; NIR II Coated; Plano-Concave Lens 750-1550nm

The 67-997 is a Plano-Concave Spherical Lens, boasting a 20mm diameter and a -40 focal length (FL). This lens is sourced from Edmund Optics, a reputable vendor known for its high-quality optical elements. The lens is designed for use within the near-infrared (NIR) spectrum, specifically between 750nm and 1550nm, making it ideal for a range of applications in this spectral region.

The lens is constructed from N-BK7 Schott glass, a material well-regarded for its excellent optical properties, including high transparency and low auto-fluorescence. This makes the lens particularly suitable for applications requiring high-fidelity optical transmission and minimal background noise.

The 67-997 lens features a standard coating on both the front and back surfaces. This coating, identified as 'edm nir-ii std curve', is specifically designed for use within the NIR-II spectral region. It enhances the lens's performance by reducing surface reflections and improving transmission efficiency, thereby maximizing the amount of light that passes through the lens.

The lens's geometry is characterized by a thickness of 5.39mm at the edge and 3.5mm at the center. The inner and outer radii are both zero, indicating a simple, circular shape. The lens's base shape is also circular, aligning with its overall geometry.