LC5289 25.4 mm Dia. CaF2 Plano-Concave Lens; EFL=-100mm Uncoated

The LC5289 is a Plano-Concave Spherical Lens, part of Thorlabs' extensive catalog of optical elements. This lens boasts a diameter of 25.4 mm and a center thickness of 3 mm, making it a compact yet robust choice for various applications. The lens's effective focal length (EFL) is -100mm, indicating its diverging nature, which is further emphasized by its concave shape.

The lens is crafted from Calcium Fluoride (CaF2), a material with the Mal-1963 designation in Thorlabs' database. This material is known for its excellent transparency in the ultraviolet, visible, and near-infrared regions of the spectrum, making the LC5289 a versatile option for a wide range of optical systems. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties. However, this also means that it may be more susceptible to environmental factors such as dust, moisture, and scratches.

The LC5289's geometry is circular, with an inner radius of 0 mm and an outer radius of 0 mm, further highlighting its simple yet effective design. It is designed to operate at a wavelength of 588 nm, although its performance may vary depending on the specific conditions of your application.