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Fractional Fourier-transform off-axis digital holographic imaging
Applied Optics- received 01/25/2024; accepted 04/15/2024; posted 04/16/2024; Doc. ID 520086
- Abstract: A fractional Fourier-transform digital holographic imaging method with resolution enhancement features ispresented. In optical configuration, an extended fractional Fourier-transform optical setup is set in the objectarm of an off-axis digital holographic recording system,to record a fractional Fourier transform hologram via theoptical interference of the fractional Fourier transformwavefront of an object wave with a reference wave. Forreconstruction imaging, the reconstruction approach forfractional Fourier transform holograms is given. In experiment, the fractional Fourier-transform digital holograms are recorded under the different recording parameters, and their amplitude images are effectivelyreconstructed. The imaging results demonstrate that thereconstruction-imaging resolution of fractional-orderFourier-transform holograms is obviously enhancedcompared to that of conventional image-plane holograms. The presented fractional Fourier-transform digital holographic imaging with resolution enhancementand optical configuration flexibility provides a novelway for off-axis digital holographic imaging.