SLSQ-20-60N 20.0 mm Dia. x -60.0 mm FL; Plano-Concave Lens Uncoated

The SLSQ-20-60N is a Plano-Concave Lens with a diameter of 20.0 mm and a focal length of -60.0 mm, making it a negatively powered lens. This lens is sourced from OptoSigma, a renowned vendor in the optical industry. The lens is made of fused silica, a material known for its excellent optical properties, including high transparency and resistance to thermal shock.

The lens's geometry is characterized by its edge thickness of 3.9 mm and center thickness of 2.0 mm. The inner and outer radii are both 0 mm, indicating a flat surface on one side and a concave surface on the other. The back focal length (BFL) is -61.4 mm, slightly longer than the effective focal length (EFL) of -60.0 mm. This discrepancy is due to the lens's concave shape, which causes the light to converge before reaching the focal point.

The SLSQ-20-60N is uncoated, meaning it does not have any anti-reflective or other coatings applied to its surfaces. This can result in unwanted reflections, especially when working with high-intensity light sources. However, uncoated lenses are often more cost-effective and can be suitable for many applications.

This lens is designed to work with a wavelength of 546.1 nm, which is in the green part of the visible light spectrum. It is suitable for use in a variety of optical systems, including beam expanders, collimators, and other applications where a negative lens is required.

Please note that the provided weblink is valid and indicates that the lens is in stock, making it readily available for your optical needs.