Phase-shifting digital holography (PSDH) is considered as a promising imaging technique with wide application in optical storage, topography measurement and defect detection. The amplitude-only vortex lens is a kind of diffractive optical elements (DOEs) which can be used for focusing and imaging in a wide spectral region, such as coherent X-rays and terahertz wave. Here four-step PSDH with an amplitude-only vortex lens is proposed. Four frames of hologram can be recorded by rotating the vortex lens installed in the reference beam path. Both a 1951 U.S. air force resolution test target and a vortex focal spot are measured by four-step PSDH with vortex lens. The experimental results are in good agreement with the theoretical analysis and verify the validity of our proposed PSDH with vortex lens.
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