LC2873-A 9 mm Dia. N-SF11 Plano-Concave Lens; EFL=-18mm 350-700nm

The LC2873-A is a plano-concave lens with a 9 mm diameter, sourced from the renowned optical components manufacturer, Thorlabs. This lens is designed for use in the ultraviolet to near-infrared spectrum, specifically between 350 and 700 nanometers.

The lens features an effective focal length (EFL) of -18mm, indicating its concave nature. The negative focal length implies that light rays, after passing through the lens, will diverge, making it suitable for applications such as beam expansion or collimation.

The lens is made from N-SF11 Schott glass, a material known for its high refractive index and low dispersion. This makes the lens ideal for applications requiring high optical performance and color correction.

The LC2873-A is coated with Thorlabs' anti-reflection coating, denoted as "tho a bbar". This coating is applied to both the front and back surfaces of the lens, reducing surface reflections and increasing transmission.

The lens has a center thickness of 2.5mm, providing sufficient mechanical strength while maintaining minimal optical distortion. The lens is spherical in shape, ensuring a smooth and consistent curvature for optimal light transmission.