SLSQ-15-20N 15.0 mm Dia. x -20.0 mm FL; Plano-Concave Lens Uncoated

The SLSQ-15-20N is a plano-concave lens with a diameter of 15.0 mm and a focal length of -20.0 mm, making it a negatively powered lens. This lens is sourced from OptoSigma, a renowned vendor in the optical industry, and is made of fused silica, a material known for its excellent optical properties and durability.

The lens's geometry is characterized by its edge thickness of 5.9 mm and center thickness of 2 mm. The inner and outer radii are both 0 mm, indicating a planar surface on one side and a concave surface on the other. The back focal length (BFL) is -21.4 mm, and the effective focal length (EFL) is -20 mm. The radius of curvature (R1) is -9.2 mm.

This lens is uncoated, meaning it does not have any anti-reflective or other coatings applied to its surfaces. While this may result in higher reflective losses, it also means that the lens can be used over a broad spectrum of wavelengths, including the visible and near-infrared regions.

The SLSQ-15-20N is available for purchase through the vendor's website, where more detailed specifications and technical drawings can be found. This lens is suitable for various applications, including imaging systems, beam shaping, and optical testing, among others.