LC2679-B 25.4 mm Dia. N-SF11 Plano-Concave Lens; EFL=-30mm 650-1050nm

The LC2679-B is a 25.4 mm diameter Plano-Concave Spherical Lens, designed and manufactured by Thorlabs. This lens is specifically engineered for use within the wavelength range of 650-1050nm, making it suitable for a wide array of optical applications.

The lens features an effective focal length (EFL) of -30mm, indicating its concave design. 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.

The lens is constructed from N-SF11 Schott glass, a material known for its high refractive index and low dispersion. This makes the lens particularly effective at bending light without causing significant chromatic aberration.

The lens's geometry includes a center thickness of 3.5mm, and its spherical shape is defined by a radius of curvature (R1) of -23.4mm on the concave surface. The lens does not have an inner or outer radius.

The lens is coated with a broadband anti-reflection coating, denoted as 'tho b bbar' for both the front and back surfaces. This coating is designed to reduce surface reflections and increase transmission, thereby enhancing the overall efficiency of the optical system.

The lens is currently in stock and available for immediate purchase through the provided weblink.