SLSQ-20B-20N 20.0 mm Dia. x -19.7 mm FL; Double-Concave Lens Uncoated

The SLSQ-20B-20N is a high-quality double-concave lens offered by OptoSigma, a leading vendor in the optical industry. This lens is designed with a base shape of a circle and features a spherical geometry, making it suitable for a wide range of optical applications.

The lens has a diameter of 20.0 mm and a thickness at the edge of 7.9 mm. The center thickness is 2 mm, providing a robust structure while maintaining a sleek profile. The effective focal length (EFL) of this lens is -19.7 mm, indicating its double-concave nature. The first radius of curvature (R1) is -18.4 mm, and the second radius of curvature (R2) is 18.4 mm, contributing to its concave-concave design.

The lens is made from fused silica, a material known for its excellent optical properties and durability. This material is identified as "fused sil mal-1965" in the item data. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties. However, this lens is still capable of delivering high-quality performance in the visible light spectrum, specifically at a wavelength of 546.1 nm.