Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. A top-view photograph of the experimental setup used for the generation of positron beams based on the LWFA.
  • Fig. S2. 2D-PIC simulation results for an LWFA driven by full 2.1-J, 800-nm, and 30-fs laser pulse with p-polarization.
  • Fig. S3. Simulation of the SHG process.
  • Fig. S4. Side-view plasma shadowgraph for the relative time zero (T0 ~ 0 fs) between the main FL and SH pulses. A 30-fs probe laser beam (800 nm) was used as a back lighter.

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