Reshaping mirror group design method capable of converting elliptical gaussian light beam into circular flat-topped light beam

The invention discloses a reshaping mirror group design method capable of converting an elliptical gaussian light beam into a circular flat-topped light beam and belongs to the technical field of laser reshaping. The reshaping mirror group design method includes a first step of solving a coordinate relationship, deriving the coordinate relationship of an incident elliptical gaussian light beam and an emitting elliptical gaussian light beam in an x-y plane by using the law of conservation of energy according to the shape of non-rotary symmetric light beam of the elliptical gaussian light beam, a second step of solving a surface shape expression of a reshaping mirror group, wherein a surface shape equation of a first reflector is z=G (x, y), and a surface shape equation of a second reflector is Z=F (x, y), deriving the surface shape equations of the first reflector and the second reflector through derivation and quadrature, and obtaining numerical solutions of the surface shape equations of the two reflectors b