LC4252-C 25.4 mm Dia. UVFS Plano-Concave Lens; EFL=-30mm 1050-1700nm

The LC4252-C is a 25.4 mm diameter Plano-Concave Spherical Lens, sourced from the renowned optical components manufacturer, Thorlabs. This lens is designed for use within the wavelength range of 1050-1700nm, making it suitable for a variety of applications within the near-infrared spectrum.

The lens features an Effective Focal Length (EFL) of -30mm, indicating its concave geometry. The EFL is a critical parameter in lens selection, influencing the convergence or divergence of light passing through the lens. A negative EFL, as in this case, results in diverging light, making the LC4252-C ideal for use in applications such as beam expansion or collimation.

The lens is constructed from UVFS material, identified by the Material ID "uvfs mal- 1965". This material is known for its transparency within the specified wavelength range, ensuring optimal light transmission.

The LC4252-C is coated with Thorlabs' proprietary coating, denoted as "tho c bbar". This coating is applied to both the front and back surfaces of the lens, enhancing its overall transmission and reducing unwanted reflections.

With a diameter of 25.4mm and a center thickness of 3mm, the LC4252-C offers a compact and robust design. The lens's geometry is defined by a radius of curvature (R1) of -13.8mm on the concave surface, and an inner and outer radius of 0mm, indicating a planar surface on the opposite side.