Phase-only Fourier Transform of an Amplitude Mask

Various types of phase-only filters for correlators have been proposed. Accordingly, the Fourier transform of a phase-only object has been widely discussed in the literature. A phase-only filter produces a specific intensity pattern of its Fourier transform. On the contrary, we reported recently an optical mask that can produce a phase-only Fourier transform. Since the produced Fourier transform is a phase-only function, the intensity pattern will be uniform. The optical mask can be applied for focusing and testing optical apparatus such as telescopes and for testing the human eye's accommodation capability.

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