SLSQ-20B-50N 20.0 mm Dia. x -49.7 mm FL; Double-Concave Lens Uncoated

The SLSQ-20B-50N is a high-quality double-concave lens offered by OptoSigma, a leading vendor in the optical industry. This lens, designed for use in a variety of optical systems, features a spherical geometry with a diameter of 20.0 mm and a base shape of circular.

The lens boasts a center thickness of 2.0 mm and an edge thickness of 4.2 mm, providing a robust and durable structure. The effective focal length (EFL) is -49.7 mm, indicating a strong converging effect. The radii of curvature for the first and second surfaces are -46 mm and 46 mm, respectively, contributing to the double-concave design.

The lens is made from fused silica, a material known for its excellent optical properties, including high transparency and resistance to thermal shock. This makes the SLSQ-20B-50N suitable for use across a wide spectrum, with a specified wavelength of 546.1 nm.

Notably, this lens is uncoated, offering users the flexibility to apply their own coatings based on their specific application requirements. However, it's important to note that uncoated lenses may have higher reflectivity, which could affect the overall performance of the optical system.