Macroenergy ultrashort pulse nonlinear broadening device

The invention discloses a large-energy ultrashort pulse nonlinear broadening device, and belongs to the field of lasers. The device comprises a pulse segmentation module, a vortex light mode conversion module, a coupling module, a nonlinear broadening module, a vortex light mode inverse conversion module and a pulse beam combination module which are arranged along a light path, the pulse segmentation module segments an input single laser pulse into a plurality of laser pulses; the vortex light mode conversion module converts a laser mode into a vortex light mode; the coupling module carries out shaping and chirp quantity optimization on the laser, and the laser is guided into the nonlinear broadening module; the nonlinear broadening module carries out nonlinear broadening processing on the laser pulse; the vortex light mode inverse conversion module inversely converts the laser mode after nonlinear broadening into a fundamental mode Gaussian; and the pulse beam combining module is used for combining a plurali