Fig. 4: THG-FROG results of the MIR laser pulses based on the advanced DC-OPA scheme.
From: Dual-chirped optical parametric amplification of high-energy single-cycle laser pulses
a, Measured THG-FROG traces with a central wavelength of 2.44 µm. b, Retrieved THG-FROG traces corresponding to the data in a with an error of 0.78%. c, Reconstructed temporal profile with a pulse duration of 8.58 fs (full-width at half-maximum), where the electric-field profile (black solid line) under the cosine-like waveform (carrier wavelength, 2.44 µm) and its squared envelope (red solid line; TL shown in pink filling) are shown, respectively. d, Reconstructed spectrum (red solid line) and spectral phase (black dash line), and the measured spectrum of the final output centred at 2.44 µm (black solid line).
