Beamsplitter is an important part of optical interferometer, which is widely used in the field of laser equipment and optical communication system. The beamsplitter can divide a beam of light into two or more beams. The properties of each beam after splitting are exactly the same as the light source, and the sum of the intensity of each beam is equal to the intensity of the light source. Our beamsplitter achieves the effect of splitting light by making one part of the light pass through and the other part reflect. The wavelength of spectroscope produced by our company ranges from 355 nm to 2940 nm(uv, visible, near-infrared band, etc.), with small spectral ratio error, ion assisted deposition is used for coating, and the comprehensive performance is superior.