SLSQ-50.8B-200N 50.8 mm Dia. x -199.5 mm FL; Double-Concave Lens Uncoated

OptoSigma's SLSQ-50.8B-200N is a high-quality, double-concave spherical lens made from fused silica. This lens is characterized by its circular base shape and a diameter of 50.8 mm. The lens's edge thickness is 6.5 mm, while the center thickness is 3 mm, providing a robust and durable structure.

The lens's effective focal length (EFL) is -199.5 mm, indicating its concave nature. The first radius of curvature (R1) is -184 mm, and the second radius (R2) is 184 mm, demonstrating the lens's symmetric double-concave design. The back focal length (BFL) is -200.5 mm.

This lens is made from fused silica, a material with the material ID "fused sil mal-1965". Fused silica is known for its excellent thermal stability, low autofluorescence, and high transmission across a wide range of wavelengths, making it an ideal choice for various optical applications.

The lens is uncoated, which means it does not have any additional anti-reflective or protective coatings. While this may result in a higher reflectance at the air-glass interfaces, it also means that the lens is more cost-effective and versatile, as users can apply coatings based on their specific requirements.

The lens is designed to work with a wavelength of 546.1 nm, although it can be used with other wavelengths depending on the user's needs. This lens is currently in stock and available for purchase through the OptoSigma website.