LB4854-B UV Fused Silica Bi-Convex Lens; Dia:0.5 in; f=20.0 mm ARC 650-1050nm

The LB4854-B is a high-quality bi-convex lens, designed and manufactured by Thorlabs, a leading vendor in the optical industry. This lens boasts a diameter of 0.5 inches and a focal length of 20.0 mm, making it a versatile choice for a wide range of optical applications.

The lens is made from UV fused silica, a material known for its excellent optical properties, including high transparency across a broad spectrum, low auto-fluorescence, and high resistance to thermal shock and chemical etching. This makes the LB4854-B particularly suitable for use in UV and visible light applications.

The lens features an antireflection coating (ARC) designed for the 650-1050nm wavelength range. This coating reduces surface reflections, thereby increasing the amount of light transmitted through the lens. The coating is applied to both the front and back surfaces of the lens, ensuring optimal performance.

The geometry of the lens includes a center thickness of 4.2 mm and an edge thickness of 1.8 mm. The radii of curvature for the front and back surfaces are 17.7 mm and -17.7 mm, respectively, resulting in a back focal length of 18.5 mm. The lens has a circular base shape and a spherical shape.