G311335000 31.5 mm Dia. N-BK7 Double-Convex Lens; EFL=130mm Uncoated

The G311335000 is a 31.5 mm diameter, double-convex lens made from N-BK7 glass, a popular material in the optical industry due to its excellent optical properties. This lens, sourced from Qioptiq Photonics, is uncoated and has an effective focal length (EFL) of 130mm, making it suitable for a wide range of applications.

The lens's geometry is characterized by its base shape, which is circular, and its thickness. The edge thickness is 2.2mm, while the center thickness is 4mm, indicating a significant curvature. The radii of curvature for the first and second surfaces are 134.325mm and -134.325mm respectively, suggesting a symmetrical design. The lens's inner and outer radii are both zero, indicating a uniform curvature across the lens.

The lens is made from n-BK7 Schott, a type of borosilicate glass known for its low dispersion and high transmission in the visible spectrum. The lens is designed to operate at a wavelength of 587.6nm, which falls within the green region of the visible spectrum.

Notably, the lens is uncoated, meaning it does not have any anti-reflective or protective coatings. While this may result in a higher reflectivity at the air-glass interfaces, it also means the lens is more cost-effective and versatile, as coatings can be added later to suit specific application requirements.