LC4413 12.7 mm Dia. UVFS Plano-Concave Lens; EFL=-75mm Uncoated

The LC4413 is a plano-concave spherical lens, part of Thorlabs' extensive catalog of optical elements. This lens boasts a 12.7 mm diameter and a center thickness of 3.5 mm, making it a compact yet robust choice for various applications. The lens's concave shape, defined by a radius of curvature (R1) of -34.5 mm, contributes to its unique optical properties.

The lens's effective focal length (EFL) is -75 mm, indicating that it is a diverging lens, which spreads out light rays. This property is particularly useful in applications where beam expansion is required. The lens is made of UVFS material with a Mal-1965 index, optimized for use in the 588 nm wavelength range.

Notably, the LC4413 lens is uncoated. While coatings can enhance a lens's performance by reducing reflection, increasing transmission, or providing environmental protection, an uncoated lens can be a cost-effective choice for applications where these benefits are not crucial.

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