High-energy laser beam quality external field high-precision measurement method and system

The invention provides a high-energy laser beam quality external field high-precision measurement method and system, and relates to the technical field of laser beam quality measurement. The measuring system comprises a high-energy laser, a target spot instrument and an imaging system, the imaging system comprises an emitting and imaging light path unit, a light splitting unit and an image sensor which are sequentially arranged along an imaging light path, light beams emitted by the high-energy laser device are transmitted to the target spot instrument through the light splitting unit and the emitting and imaging light path unit in sequence, and a high-energy laser emitting light path is formed; and an imaging light path between the light splitting unit and the emitting and imaging light path unit and a high-energy laser emitting light path are coaxially arranged. Based on the above system, the external field hardening and tempering transfer function of the imaging system can be calculated by using the real s