Large dynamic range laser linear attenuation method and attenuator

The invention provides a large dynamic range laser linear attenuation method and an attenuator. The attenuator comprises a first wedge beam splitter, a second wedge beam splitter, a third wedge beam splitter and a translation platform; the first wedge beam splitter and the second wedge beam splitter are arranged in parallel, the bottom planes of the two wedge beam splitters are parallel to each other; the third wedge beam splitter is positioned at one end of the second wedge beam splitter, and the attenuated laser is reflected from the third wedge beam splitter; the third wedge beam splitter and the second wedge beam splitter are installed on the translation platform, and the moving direction of the translation platform is vertical to the normal direction of the bottom plane of the secondwedge beam splitter. The attenuation multiple of the laser is changed by changing the relative position of the two wedge beam splitter. The laser only reflects on the surface of the wedge beam splitter without through other m