Figure 2: Fringe spacing versus pump–probe delay.
From: Long-term mutual phase locking of picosecond pulse pairs generated by a semiconductor nanowire laser
(a) Selected optical spectra recorded from the NW laser subject to a pump pulse in the lasing regime and a probe pulse in the ASE regime (L-ASE) for Δt=+10 ps (green), Δt=+20 ps (red) and Δt=+30 ps (blue). The inset shows a zoom-in of the spectrum, demonstrating that modulation is still observed and that the spacing is close to the resolution limit. (b) Repetition rate (red circles) and NW laser pulse separation (blue circles) as a function of Δt, measured from the separation of the interference fringes in the NW laser spectra and their inverse in a, respectively.
