The transmission range of silicon window slice is 1.2 μ m-8 μ m, which is mainly used as the substrate of infrared window slice and optical filter within 6 u m. Because of its good thermal conductivity and low density, this material is also a common material for making laser mirrors. It is mainly used for PVD/CVD coating as substrate for XRD (x-ray analysis), SEM (scanning electron microscope), AFM (atomic force microscope), FTIR infrared, fluorescence spectrum and other analysis and test substrates; Synchrotron radiation experiment sample carrier; Substrate of molecular beam epitaxy growth; Semiconductor lithography process, etc.