Complete intensity and phase characterization of a 2.5 THz dark soliton pulse train via frequency resolved optical gating

Summary form only given. Ultrafast optical pulse trains at THz frequencies for applications in spectroscopy and mm-wave communications are conveniently generated via soliton train formation in optical fibers. A major difficulty with developing optical THz sources, however, is that an ultrafast pulse train cannot be directly characterized using photodiodes or streak cameras. In the paper, we demonstrate that frequency-resolved optical gating (FROG) can be applied to ultrafast pulse trains, and we report the experimental intensity and phase characterization of a 2.5 THz train of dark solitons.