Figure 2

Basic performance of FACED based on the SE scheme. (a) Images of three different patterns of scanned spots generated by FACED, that is, the projection of the virtual source arrays onto the focal plane of the objective lens at three mirror misalignment angles α. In general, the number of scanned spots and the spot density increase from case to case to case . Scanning-beam pattern , which is a continuous line-beam profile, was used for the time-stretch imaging performed in this work. The scale bar represents 5 μm. (b) Time-stretched waveform, which consists of a train of sub-pulses, corresponding to scanning-beam pattern . (c) (Top) Zoomed-in view of the intensity profile along the green line (red area) in . (Bottom) Zoomed-in view of the temporal profile in the yellow area of b. (d) Reconfigurability of the number of virtual sources, and thus the dispersion (D_λ,Total), by varying the mirror misalignment angle α. The red dots represent the measured data, and the blue line shows the linear fit to the data. The slope of the fit corresponds to the input light cone angle Δθ. Cases , and depicted in a are highlighted in the plot. (e) Single-shot time-stretched waveform (red) and the corresponding spectrum (black) measured using a conventional spectrometer with a total dispersion of –2 ns nm⁻¹. Notably, the spectrum was shaped by placing two fiber needles at the intermediate conjugate plane of the virtual sources (to generate two intensity dips in the spectrum). (f) Evolution of the temporal profile of the stretched pulse within the range of normal dispersion (that is, D_λ,Total=–200 ps nm⁻¹ to –2.5 ns nm⁻¹). The dispersion can be tuned in both the normal and anomalous dispersion regimes (Supplementary Fig. S14). (g) Dependence of the losses measured at the focal plane and after the beam splitter (BS, refer to Figure 1b) on the total dispersion.