Combined beam modulation laser amplifier and system

The invention provides a combined light beam modulation laser amplifier and system, and belongs to the technical field of laser amplifiers. The laser amplifier comprises a first fixing part which is internally provided with a through cavity; the laser amplification modules are arranged in the cavity at intervals, and a closed cooling cavity is defined by each laser amplification module and the first fixing part in a surrounding mode; and the micro-optical elements are respectively arranged between the two adjacent laser amplification modules, and the micro-optical elements are connected with the first fixing piece. According to the invention, through superposition of the plurality of laser amplification modules, the laser amplifier with more gain media connected in series is further obtained, and a micro-optical element is added between two adjacent laser amplification modules to further modulate a transmission light beam, so that the purposes of high-power output and efficient heat dissipation of the laser a