Abstract
We demonstrate that the two-dimensional quadrature transform property of a spiral-phase filter may be utilized for addressing the noninterferometric iterative phase imaging problem. Two intensity measurements for an unknown input object are performed in the back focal (Fourier transform) plane of a lens with and without a spiral-phase mask in the lens aperture. It is shown that the two intensity measurements along with the aperture support constraint can be used for estimating the phase of an unknown input object with an iterative algorithm. Numerical simulations are presented for comparison of the new spiral-phase diversity technique and the more standard defocus-diversity method. Experimental results for the spiral-phase diversity are also shown to illustrate the effectiveness of this approach for imaging of amplitude/phase objects.
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