The CaF2-W-50.8x3 is a flat window type optical element, sourced from Alkor Technologies, with a circular base shape and a diameter of 50.8 mm. This window has a thickness of 3 mm and is made of Calcium Fluoride (CaF2) with the material ID "caf2 mal-1963".
The window is designed to operate at a wavelength of 633 nm and features a thin lens shape. It is uncoated, which means it does not have any anti-reflective or other coatings applied to its surfaces.
According to the vendor's website, this item is currently in stock. For more detailed information, you can refer to the vendor's website using the provided weblink: http://www.alkor.net/CaF2_windows.html.