Extended Data Fig. 3: Second-harmonic-generation FROG measurements of the optical pulses after compression.
From: Polarized phonons carry angular momentum in ultrafast demagnetization
a, Measured FROG trace. b, Retrieved FROG trace at 0.3% FROG error. c, Evaluated spectrum (blue) and spectral phase (green). d, Retrieved pulse shape (blue) with temporal phase (green). The pulse duration is 93 fs.
