Non-polarizing beam splitter is an optical beam splitting component. Its core design principle is: it is insensitive to the polarization state of the incident light and can evenly split any polarized incident light according to a specific ratio. It is composed of a pair of right-angle prisms bonded together, and the inclined surface of one of the prisms is coated with a metallic dielectric film. The S/P polarization error of the transmitted and reflected light is less than 6%, that means it will not change the polarization of the incident beam. It is widely used in laser processing and multi-path systems, optical interference and precision measurement, microscopic imaging and spectral analysis, etc.