112-5228E 25.4 mm Dia. x -400 mm FL; Uncoated; Plano-Concave Lens

The 112-5228E is a plano-concave lens, a type of spherical lens, sourced from EKSMA Optics. This lens has a base shape of a circle and is designed for use in various optical applications. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties or protect it from environmental factors.

The lens has a diameter of 25.4 mm and a thickness at the edge of 4 mm. The center thickness is slightly less at 3.5 mm. The effective focal length (EFL) of this lens is -400 mm, indicating that it is a diverging lens, causing parallel light rays to spread out. The radius of curvature (R1) is -167.3 mm, and the inner and outer radii are both 0 mm, suggesting that the lens is plano on one side and concave on the other.

The lens is made of CAF2 (Calcium Fluoride) material, specifically the mal-1963 variant. This material is chosen for its excellent optical properties, including a high transmission rate in the ultraviolet region of the spectrum, making it suitable for use at a wavelength of 2940 nm.