Fig. 5: Measurements of the single-shot CEP in the f-to-2f interferometer and beam quality.
From: Dual-chirped optical parametric amplification of high-energy single-cycle laser pulses
a, Temporal evolution of the f-to-2f spectral interference fringes, where a single shot of the spectrum was obtained for each record. b, CEP shift extracted from the spectrogram depicted in a. The r.m.s. error of the CEP shift was evaluated to be 228 mrad. c, Evolution of the beam diameters (full width at e−2 maximum) along the x axis (horizontal direction, black circles) and y axis (vertical direction, red squares) with the beam propagation across the focal point. The evaluated M2 values for the x and y axes by fitting each measured diameter were 1.24 (black solid line) and 1.29 (red solid line), respectively. The corresponding beam profile at the focal point is shown in the inset.
