Linear spot scanning laser chemical micro-thruster

The invention relates to a linear spot scanning laser chemical micro-thruster capable of providing mN micro-thrust. The micro-thruster comprises a photosensitive propellant, a cylindrical combustion chamber, a Laval nozzle, a rotary steering gear and a linear spot laser. The rotary steering engine drives the linear spot laser to perform 360-degree stepping rotation, the linear spot laser scans andignites the photosensitive propellant in the cylindrical combustion chamber, and fuel gas is sprayed out via the Laval nozzle and generates mN thrust. The rotary steering gear can adjust the rotationangle and rotation speed, so that laser scanning speed of a linear spot is adjusted, the photosensitive propellant can be subjected to non-self-sustained combustion under laser irradiation, combustion and extinguishing of the propellant are achieved by turning on or turning off the laser, and thus, repeated start of thrust is achieved. The micro-thruster has small size and low weight, and can generate mN thrust under the