This is a CaF2-W-25.4x4 25.4 mm Dia. CaF2 Flat Window with a thickness of 4mm, uncoated and sourced from Alkor Technologies. The item is a flat window, a type of optical element designed to allow light to pass through while minimally altering the light's path or intensity.
The window is circular in base shape with a diameter of 25.4 mm, making it suitable for a wide range of optical applications. The material used for this window is Calcium Fluoride (CaF2), identified as "caf2 mal-1963" in the Material ID. Calcium Fluoride is a popular material in optical applications due to its excellent transparency across a wide spectrum, including the ultraviolet, visible, and infrared regions.
The item is designed in the shape of a thin lens, which is a lens with a thickness that is small compared to its diameter. This design feature contributes to the window's minimal light alteration properties.
The window is uncoated, meaning it does not have any additional layers applied to its surface to alter its optical properties. This can be beneficial in applications where the natural properties of Calcium Fluoride are desired.
The window is currently in stock and more information about this item can be found on Alkor Technologies' website at http://www.alkor.net/CaF2_windows.html.