Common-path quantitative phase imaging by propagation through a sinusoidal intensity mask

Abstract

We present a new quantitative approach for phase retrieval that is derived from the analysis of light intensity propagation through a phase object and a sinusoidal intensity mask positioned into the light path. Unlike the Transport of Intensity Equation (TIE), we deduce a new algorithm that results in a simpler expression since it does not include the Laplacian of the phase. In practice, the method is implemented in a common path optics where each optical component of the assembly remains fixed and phase unwrapping is not required. We introduce the analytical expressions for this algorithm and show experimental results including the phase retrieval of a phase object and of cheek cell samples.