Wavefront correction of the PW laser system at IBS-GIST (Korea) was successfully performed using double deformable mirror system. Residual wavefront error was 0.071 μm (RMS) and 0.374 μm (PV). The wavefront-corrected PW laser beam was focused by an f/1.6 off-axis parabola (450 mm effective focal length). A focal spot size (FWHM) was 1.5 μm horizontally and 1.8 μm vertically. Considering the peak power of 3 PW, the focused peak intensity is 6×1022 W/cm2, which is the highest intensity ever reached. Thus, it would be possible to achieve the peak intensity over 1023 W/cm2 by using an f/1.0 off-axis parabola.
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