LAUSR

Abstract A single-shot phase-retrieval algorithm based on axial phase diversity using a distorted phase grating is proposed. In this proposed scheme, an image array corresponding to different defocus distances of the object is formed on the fixed and static detector plane and is recorded simultaneously with one camera shot. After the recorded image array is split into separated sub-images, an iterative phase-retrieval algorithm is applied to retrieve the complex amplitude of the object. Compared with the method of multiple recordings, the proposed scheme has the advantages of fast data acquisition and a corresponding high temporal resolution, making it very suitable for high-speed phase imaging or pulsed laser beam diagnosis. Computer simulations are performed to verify the feasibility of the proposed scheme.