SLSQ-20B-70P 20.0 mm Dia. x 70.6 mm FL; Double-Convex Lens Uncoated

The SLSQ-20B-70P is a high-quality double-convex lens offered by OptoSigma, a renowned vendor in the optical industry. This lens, with a diameter of 20.0 mm and a focal length of 70.6 mm, is designed for use in a variety of optical systems.

The lens is made of fused silica, a material known for its excellent optical properties, including high transparency and resistance to thermal shock. The base shape of the lens is circular, and it features a double-convex geometry, with radii of curvature of 64.4 mm for the first surface and -64.4 mm for the second surface. This geometry results in a back focal length of 69.4 mm.

The lens is uncoated, which means it does not have any anti-reflective or other coatings applied to its surfaces. This can be advantageous in certain applications where the user wants to control the reflection characteristics of the system themselves. However, it's important to note that uncoated lenses can suffer from higher levels of reflection, which can reduce the overall efficiency of the system.

The lens has a thickness of 2 mm at the edge and 3.6 mm at the center. This thickness distribution ensures the lens's structural integrity while minimizing its impact on the overall optical path.

The SLSQ-20B-70P is designed for use at a wavelength of 546.1 nm, making it suitable for a wide range of applications in the visible spectrum. It's important to note that the lens's performance can vary depending on the specific conditions of use, including the angle of incidence, the numerical aperture, and the spectral bandwidth.