Fig. 5
From: Odd electron wave packets from cycloidal ultrashort laser fields
Spiral-shaped FEWPs with sevenfold rotational symmetry from time-delayed (3ω:4ω) CRCP pulses. Energy-calibrated central x-y sections through the reconstructed PMDs for different time delays τ1 between an LCP red and an RCP blue pulse. a The negative time delay of τ1 = −10 fs (red pulse precedes the blue) produces a 7-armed spiral with clockwise sense of rotation in the laser polarization plane. b Reversal of the pulse ordering by changing the sign of τ1 inverts the rotational sense. c By separating the pulses in time (τ1 = −20 fs) the CRCP sequence becomes circularly symmetric. However, the FEWP retains its sevenfold rotational symmetry. The time delays were extracted from the slope of the tilted lobes using PCA. The given uncertainties are statistical errors from the average over the results obtained for each of the seven lobes
