SLB-25-40NIR2 25.0 mm Dia. x -40.0 mm FL; Coated; Plano-Concave Lens 750-1550nm

The SLB-25-40NIR2 is a Plano-Concave Spherical Lens, sourced from the reputable vendor OptoSigma. This lens boasts a diameter of 25.0 mm and a focal length of -40.0 mm, making it suitable for a wide range of optical applications.

The lens is crafted from n-bk7 schott, a high-quality optical glass known for its excellent transmittance and homogeneity. This material is particularly suitable for use in the infrared spectrum, with this lens specifically designed for use between 750-1550nm.

The lens features a double-sided coating of opt ir2, which is optimized for the infrared spectrum. This coating enhances the lens's performance by reducing surface reflections and improving transmission.

The geometry of the lens is also noteworthy. It has an edge thickness of 6.2 mm and a center thickness of 2 mm, providing a robust and durable structure. The inner and outer radii are both 0, indicating a flat surface on both sides of the lens.

The lens's curvature is defined by a radius of 20.76 mm on the concave side. The back focal length is -41.3 mm, which is the distance from the lens's rear surface to the focal point.