Wavefront correction near the focus of Pettawatt laser system for high-field science experiment

A wavefront correction near the focus of a Pettawatt laser system is demonstrated. After correction, the Strehl ratio of focus is improved to 0.90, and the focal spot size using the f/4 off-axis parabola is reduced to 6.20 × 6.77 μm
²
. With full peak power, the peak intensity of 2.46 × 10
²¹
W/cm
²
is obtained.