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Figure 1
The fractional Fourier transform can be seen as a free space propagation between two planes p1 and p2 by using quadratic phase factors, as indicated by the two parabolic surfaces q1 and q2. See the main text. In this case the sign of the two curvatures are [{R_1}\,\lt\,0] and [{R_2}\,\gt\,0].

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SYNCHROTRON
RADIATION
ISSN: 1600-5775
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