X-ray windows are specialized thin film materials used in X-ray analysis systems. Their primary function is to allow X-rays to pass through and interact with the sample while isolating the vacuum environment from the sample's atmosphere. X-ray windows are commonly used in X-ray spectroscopy, X-ray imaging, X-ray diffraction (XRD), and other applications. Materials such as silicon nitride (Si₃N₄), beryllium, aluminum, and carbon nanotubes are frequently used for these windows.