LB4821-A UV Fused Silica Bi-Convex Lens; Dia:2 in; f=100.0 mm ARC 350-700nm

The LB4821-A 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 2 inches, or 50.8 millimeters, and a focal length of 100.0 millimeters, making it suitable 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 (350-700nm) and a low coefficient of thermal expansion. This makes the LB4821-A an ideal choice for applications that require high precision and stability, such as laser systems, interferometry, and imaging applications.

The lens features a spherical geometry, with radii of curvature of 90.4 millimeters for the first surface and -90.4 millimeters for the second surface. This geometry, combined with the lens's high-quality anti-reflection coating (ARC), ensures efficient light transmission and minimal optical losses. The ARC is designed to reduce surface reflections to less than 0.5% at 450-700 nm and less than 1% at 350-450 nm.

The lens has a thickness of 3 millimeters at the edge and 10.3 millimeters at the center, providing excellent mechanical stability. The lens's effective focal length (EFL) is 100.0 millimeters, and its back focal length (BFL) is 96.4 millimeters. The lens's inner and outer radii are 0 millimeters, indicating a uniform curvature across the lens surface.