The SLSQ-20B-30N 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 5.8 mm. The center thickness is 2.0 mm, providing a sleek and compact design. The effective focal length (EFL) of this lens is -29.7 mm, indicating its double-concave nature. The first radius of curvature (R1) is -27.6 mm, while the second radius (R2) is 27.6 mm, contributing to its concave-concave structure.
The back focal length (BFL) of this lens is -30.3 mm. Notably, the inner and outer radii are both 0 mm, suggesting a uniform curvature throughout the lens. The lens is made of fused silica, a material with the material ID "fused sil mal-1965", which is known for its excellent optical properties and durability.
This lens is designed to operate at a wavelength of 546.1 nm. It does not come with any coating, offering a bare, uncoated surface. This could be ideal for applications where coating might interfere with the desired optical properties.