LB4915-UV 12.7 mm Dia. UVFS Double-Convex Lens; EFL=50mm 245-400nm

The LB4915-UV is a high-quality spherical lens from Thorlabs, designed for use in ultraviolet (UV) applications. This lens, with a diameter of 12.7 mm, features a double-convex geometry, making it suitable for a wide range of optical systems.

The lens has an effective focal length (EFL) of 50mm, which is a common choice for many applications due to its versatility. The EFL is the distance from the center of the lens to the point at which light rays converge or diverge. This lens's EFL makes it ideal for use in systems where a moderate level of magnification or minification is required.

The LB4915-UV is made from UVFS, a material specifically designed for UV applications. It has a refractive index that allows for efficient transmission of UV light, making it an excellent choice for systems operating in the 245-400nm range.

The lens features broadband anti-reflection (BBAR) coatings on both the front and back surfaces. These coatings are designed to reduce surface reflections, thereby increasing the amount of light transmitted through the lens. The BBAR coating on this lens is optimized for use in the UV region, further enhancing its performance in these applications.

In terms of geometry, the lens has a thickness of 1.8mm at the edge and 2.7mm at the center. The radii of curvature for the front and back surfaces are 45.6mm and -45.6mm, respectively. The lens has no inner or outer radius, indicating a uniform curvature across its surface.