45-698 6.0mm Dia. x -12 FL; Uncoated; UV Plano-Concave Lens

The 45-698 is a 6.0mm diameter Plano-Concave lens with a focal length of -12 FL, sourced from the reputable optical vendor, Edmund Optics. This lens is designed for use in ultraviolet (UV) applications, making it suitable for a wide range of scientific and industrial uses.

The lens is fabricated from fused silica, a material with a high transmission rate in the UV range, ensuring optimal performance in its intended application. The base shape of the lens is circular, and it features a spherical geometry, with a center thickness of 2mm and an edge thickness of 2.71mm. The inner and outer radii are both 0, indicating a plano surface on both sides of the lens.

The lens's base curvature, or radius of curvature (R1), is -5.5, contributing to its concave shape. The back focal length (BFL) is -13.38, and the effective focal length (EFL) is -12, as indicated in the item data.

Notably, this lens is uncoated, which may affect its performance in certain applications. Coatings are often applied to lenses to enhance their durability, reduce surface reflections, or alter their wavelength response. However, in this case, the lens's uncoated state may be advantageous in UV applications, where minimal absorption and high transmittance are critical.