SLSQ-20B-40N 20.0 mm Dia. x -39.7 mm FL; Double-Concave Lens Uncoated

The SLSQ-20B-40N is a high-quality double-concave lens offered by OptoSigma, a leading vendor in the optical industry. This lens, designed for use in a wide range of optical systems, features a spherical geometry with a diameter of 20.0 mm and a base shape of circular.

The lens boasts a significant double-concave design, with a center thickness of 2.0 mm and an edge thickness of 4.8 mm. The effective focal length (EFL) is -39.7 mm, making it suitable for applications requiring strong negative lensing. The radii of curvature for the two surfaces are -36.8 mm and 36.8 mm, respectively, contributing to its double-concave shape.

The lens is crafted from fused silica, a material known for its excellent optical properties and high damage threshold. This makes the SLSQ-20B-40N an ideal choice for applications that require high precision and durability. The lens is uncoated, providing users with the flexibility to apply their preferred coating based on their specific application requirements.

This lens is designed to operate at a wavelength of 546.1 nm, making it suitable for a wide range of applications in the visible light spectrum. It's important to note that the lens is not coated, so users may need to consider adding an anti-reflective coating to enhance transmission and reduce unwanted reflections.