This is a CaF2-W-25.4x1 25.4 mm Dia. CaF2 Flat Window, with a thickness of 1mm and uncoated. It is sourced from Alkor Technologies, a reputable vendor in the optical industry. The window is of the flat variety, designed with a base shape that is circular, and has a diameter of 25.4 mm.
The material of this window is Calcium Fluoride, identified as "caf2 mal-1963" in the Material ID. This material is known for its excellent transparency in the ultraviolet, visible, and near-infrared regions of the spectrum. The wavelength of this particular window is 633 nm, which falls within the visible light spectrum.
The window is designed in the shape of a thin lens, which is a lens with a very small focal length compared to its diameter. This design allows for minimal distortion and a wide field of view. The window is uncoated, meaning it does not have any additional layers applied to its surface to alter its optical properties.
For more information and to check the current stock status, you can refer to the vendor's website at http://www.alkor.net/CaF2_windows.html.