a laser oscillator that outputs a laser beam;

a LASER BEAM IRRADIATION AREA GENERATOR that generates a square pyramid-shaped laser beam irradiation area in air based on the output laser beam; and

a controller that controls the LASER BEAM IRRADIATION AREA GENERATOR to generate a square pyramid-shaped laser beam irradiation surface having an energy density equal to or greater than a preset threshold in the square pyramid-shaped laser beam irradiation area and controls to generate the square pyramid-shaped laser beam irradiation area which is a three-dimensional space from the laser device to the square pyramid-shaped laser beam irradiation surface and in which aircraft located on the square pyramid-shaped laser beam irradiation area is hit with the laser beam,

wherein the LASER BEAM IRRADIATION AREA GENERATOR includes:

a beam transmission optical system that reflects the output laser beam and transmits the reflected output laser beam to a rotating mirror unit;

a rotating mirror unit that has a plurality of mirrors provided on a circumference and irradiates the reflected laser beam into the air through the mirror as the rotating mirror unit rotates;

a tilting unit that tilts a rotation axis of the rotating mirror unit; and

the controller controls to generate the square pyramid-shaped laser beam irradiation surface based on x-axis scanning of the rotating mirror unit and y-axis scanning performed by the tilting of the rotating mirror unit.