SLB-25B-35P 25.0 mm Dia. x 36.1 mm FL; Double-Convex Lens Uncoated

The SLB-25B-35P is a high-quality double-convex lens offered by OptoSigma, a renowned vendor in the optical industry. This lens, with a diameter of 25.0 mm, is designed for use in a wide range of optical applications. The lens's double-convex shape, characterized by two spherical surfaces that curve outwards, is a common design in optical systems due to its ability to focus light to a single point.

The lens's geometry is defined by its thickness at the edge (2.0 mm) and center (6.4 mm), and its effective focal length (EFL) of 36.1 mm. The EFL, which is the distance from the lens's principal point to the focal point, is a critical parameter in lens selection. The lens's radii of curvature (R1 and R2) are 36.33 mm and -36.33 mm, respectively, indicating a symmetrical design. The back focal length (BFL) is 33.9 mm, which is the distance from the lens's rear surface to its focal point.

The SLB-25B-35P is made from N-BK7 Schott, a popular optical glass due to its excellent optical properties and wide transparency range. This lens is uncoated, meaning it does not have any anti-reflective coatings. While coatings can enhance a lens's performance by reducing surface reflections and increasing transmission, uncoated lenses are often chosen for their cost-effectiveness and simplicity.

This lens is designed for use at a wavelength of 546.1 nm, a common reference wavelength in optical systems. It's important to note that the lens's performance can vary depending on the wavelength of light used.