Abstract
We present a simple yet effective method, without the need for any additional recording of intensity maps or tremendous iterative computations, to recover reference-wave intensity resulting from the complex hologram acquired by quadrature phase-shifting holography. This is achieved by utilizing a certain area of interest in the complex hologram. We select a particular area in the complex hologram where there is negligible diffraction from the test sample to estimate the reference-wave intensity. The calculated intensity value allows us to extract exact phase distribution of the object in the context of two-step-only quadrature phase-shifting holography (TSO-PSH) without the zeroth-order beam and the twin image noise on the reconstruction plane. Computer simulation and experimental results have been performed to verify the effectiveness and feasibility of our proposed method.
Highlights
Digital holography (DH) is utilized for recording and reconstructing the intensity and phase of microstructures with high efficiency and precision, due to recent advances in charge-coupled devices (CCDs) and computers [1,2]
We have focused on two-step phase shifting digital holography and proposed a fast method to recover the reference-wave intensity from the complex hologram without using either iteration procedure or physical measurement for exact phase retrieval
We select a particular area in the complex hologram where there is negligible diffraction on the CCD from the test sample to estimate A
Summary
Digital holography (DH) is utilized for recording and reconstructing the intensity and phase of microstructures with high efficiency and precision, due to recent advances in charge-coupled devices (CCDs) and computers [1,2]. When on-axis geometry is employed, we can eliminate the zeroth-order beam and twin-image noise with phase-shifting holography (PSH) [8,9]. Liu and Poon have studied a method called two-step-only quadrature phase-shifting holography (TSO-QPSH) [13], which estimates the reference intensity by iterative computations instead of an actual recording. The phase distribution of the test sample could not be retrieved precisely since there exists a complex zeroth-order term in the constructed complex hologram, giving rise to a zeroth-order beam upon reconstruction In this contribution, we have focused on two-step phase shifting digital holography and proposed a fast method to recover the reference-wave intensity from the complex hologram without using either iteration procedure or physical measurement for exact phase retrieval. Computer simulation and experimental results are performed to verify the effectiveness and feasibility of our proposed idea
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