SLSQ-15-40N 15.0 mm Dia. x -40.0 mm FL; Plano-Concave Lens Uncoated

The SLSQ-15-40N is a Plano-Concave Lens with a diameter of 15.0 mm and a focal length of -40.0 mm, making it a negatively powered lens. This lens is sourced from OptoSigma, a renowned vendor in the optical industry, and is made of fused silica, a material known for its excellent optical properties and durability.

The lens's geometry is characterized by its concave shape, with a central thickness of 2.0 mm and an edge thickness of 3.6 mm. The inner and outer radii are both 0.0 mm, indicating a uniform curvature across the lens. The back focal length (BFL) is -41.4 mm, slightly longer than the effective focal length (EFL), which is -40.0 mm. This discrepancy is due to the lens's concave shape, which causes the light to converge before the focal point.

The SLSQ-15-40N is uncoated, meaning it does not have any anti-reflective or other surface treatments. This can lead to unwanted reflections, especially when working with high-intensity light sources. However, uncoated lenses are often preferred in applications where precise control over the phase and amplitude of light is required, as coatings can introduce unwanted phase shifts.

This lens is designed to work with light of wavelength 546.1 nm, which is in the green part of the visible spectrum. It is suitable for use in a wide range of optical systems, including imaging systems, beam shaping systems, and interferometers.