Experimental demonstration of parallel two-step phase-shifting digital holography

Abstract

Parallel two-step phase-shifting digital holography is a technique for single-shot implementation of phase-shifting interferometry and requires only the intensity distribution of the reference wave and spatial two phase-shifted holograms. We constructed a system of parallel two-step phase-shifting digital holography and experimentally demonstrated the technique, for the first time. The system uses an originally fabricated image sensor having an array of 2 × 1 micro polarizers. Each micro polarizer was attached on pixel by pixel. In the experiment, the unwanted images, the zero-order diffraction wave and the conjugate image, are removed from the reconstructed image of objects by the system, while the images superimpose on the image of objects reconstructed by Fresnel transform alone. Also the capability of single-shot and three-dimensional imaging is demonstrated by the system.

Single-shot phase-shifting digital holographic microscopy

“…A CCD camera (874 (V) × 1164 (H) pixels, 8 frame/s) on which an array of 2 × 1 micro polarizers was attached was used for the image sensor. The detail of the image sensor is described in [5]. The numerical aperture (N.A.)…”

“…To achieve both the elimination of the unwanted images and instantaneous 3-D measurement, parallel phase-shifting digital holography (PPSDH) [3,4], which is one of single-shot phase-shifting digital holographies, was proposed. In recent, PPSDH was experimentally verified by using an image sensor on which an array of micro polarizers was attached [5]. By the way, microscopy has contributed to the fields such as medicine, cell biology, analytical chemistry, engineering, and 3-D microscopy is one of prospective applications in digital holography [6][7][8].…”

Experimental Study of Two-step Phase-shifting Digital Holography based on the Calculated Intensity of a Reference Wave

“…Tatsuki Taharae et.al experimentally demonstrated the parallel two-step phase-shifting digital holography which requires only the intensity distribution of the reference wave and spatial two phase-shifted holograms [14]. Jung-Ping Liu and TingChung Poon adopted a correlation method to calculate the reference wave intensity [15].…”

Algorithm for compensating the non-diffraction wave in the reconstructed image in polarization-based parallel phase-shifting digital holography

“…A PPSDH system using a polarization imaging camera having a 2D micropolarizer array has been demonstrated [3], and this technique has been researched in many fields, such as microscopy [4], fluid measurement [5], and so on. However, we found out such the problem that the non-diffraction wave was not completely removed in the PPSDH system.…”