The Beamsplitter Cube is coated with a film on the bevel of a right-angled prism, and then a similar right-angled prism is glued together to form a cubic dichroic prism. It can avoid the astigmatism of the flat beam splitter, the coating is not directly exposed, and it is not easy to be damaged and corroded. When transmitting light, the Beamsplitter Cube is not affected by light deflection, so there will be no problems with beam translation, ghost images, and interference. Used for spectroscopy and imaging. No long-term calibration is required when the angle of incidence is 45°.