Figure 8.

A series of graphs showing how dechirping of the interference pattern affects the Fourier domain. As can be seen in (A,B), the dechirping of the high $\rho$ fringe pattern (A) leads to equally spaced fringes as well a Fourier transform that is the convolution of the pairwise interference terms (B). On the other hand, the dechirping of the low $\rho$ intensity pattern (C) does not aid in the reconstruction of the beam 5 terms (D) due to its differing chirp frequency (see Figure 7). The black dashed line in (B,D) denotes the Fourier transform of the overall dechirped fringe patterns (A,C). For brevity, interference between beams i and j is denoted $i-j$. The data were windowed and zero-padded to reduce ringing and other artefacts after transformation, before finally dechirping.