Device for beam split of random polarization laser

The utility model relates to a device for beam split of a random polarization laser. A first polarization stereoscopic beam splitter PBS is arranged on an output light path of the laser, a beam transmission output end and a beam reflection output end of the first polarization stereoscopic beam splitter PBS are respectively provided with a first total-reflection mirror and a second total-reflection mirror, and the beam reflection output end of the total-reflection mirrors is provided with a second polarization stereoscopic beam splitter PBS. A horizontal transmitting end of the second polarization stereoscopic beam splitter PBS is provided with a third 1/2Lambadaslide and a third polarization stereoscopic beam splitter PBS, a horizontal transmitting end of a third polarization stereoscopic beam splitter PBS is provided with a fourth 1/2Lambadaslide and a fourth polarization stereoscopic beam splitter PBS, a perpendicular transmitting end light path of the fourth polarization stereoscopic beam splitter PBS is provided with a power meter, and perpendicular transmitting ends of the second polarization stereoscopic beam splitter PBS, the third polarization stereoscopic beam splitter PBS and the fourth polarization stereoscopic beam splitter PBS are all provided with 1/4Lambadaslides and focus lens. Beam split energy control precision can be greatly improved and the device is convenient for beam split number expansion.