Figure 1
From: Proton beam quality enhancement by spectral phase control of a PW-class laser system
(a) Illustration of the DRACO PW laser, the experimental area, the two pick-off ports and the different diagnostics for time domain measurements of the laser pulse. (b) Magnified DRACO focal spot measurement at the experimental area with logarithmic color scale for absolute intensities. The black line represents a normalized horizontal line out of the focal intensity distribution, the white dashed circles represent the FWHM, 2\(\sigma\) and 4\(\sigma\) area. (c,d) Temporal intensity contrast of the DRACO laser on the: (c) ns-range (inset: 100 ps), measured with scanning TOAC (SequoiaHD), (d) ps-range for intrinsic (black) and PM cleaned (red) contrast conditions, measured with single-shot time extended self-referenced spectral interferometry technique30 (SRSI-ETE).
