LD5138 25.4 mm Dia. CaF2 Double-Concave Lens; EFL=-30mm Uncoated

The LD5138 is a spherical lens from Thorlabs, featuring a concave-concave base shape and a circular geometry. With a diameter of 25.4 mm and a center thickness of 2.5 mm, this lens is designed for use in optical systems where a negative focal length is required. The effective focal length (EFL) of this lens is -30 mm, making it suitable for a wide range of applications.

The lens is made from CaF2 (Calcium Fluoride) material, identified as "caf2 mal-1963" in the material database. This material is known for its excellent transparency in the ultraviolet, visible, and near-infrared regions of the spectrum. The lens is uncoated, which means it does not have any additional layers to enhance its optical properties.

The LD5138 is designed to operate at a wavelength of 588 nm. It has an inner radius of 0 mm and an outer radius of 0 mm, indicating a symmetrical design. This lens is a valuable addition to any optical system that requires a negative focal length element.

Please note that the information provided here is based on the item data and does not include any assumptions or additional details. For more information, please refer to the vendor's website or contact their technical support.