Dataset for near-field modulation at the last grating of mosaic grating based compressor

The wavefront or amplitude error originated from fabrication and assembly of large-aperture gratings in kilojoule petawatt laser systems compressor can be transformed into near-field modulation during propagation of the laser pulse. In severe cases, near-field modulation would induce laser damage on gratings and downstream optics, praticularly the last grating.Near-field transmission property of mosaic grating based compressor is investigated, the impact of periodic wavefront error and mosaic gap error of mosaic grating on near-field modulation is analyzed and evaluated. This dataset is a a record of the near-field modulation at the last grating induced by errors of the upstream gratings.