Two Step on-axis Digital Holography Using Dual-channel Mach-Zehnder Interferometer and Matched Filter Algorithm

Abstract

A new two step on-axis digital holography (DH) is proposed without any assumptions, phase shifting, or complicated optical components. A dual-channel Mach-Zehnder interferometer was employed. Using that setup, the object field can be reconstructed requiring only two step measurements. To eliminate position difference between two charge-coupled device (CCD) cameras, a matched filter algorithm was used. Experimental results are compared to those of the traditional phase shifting technique. The proposed approach can also be applied to single-exposure on-axis DH for real time measurement.

Dual-plane in-line digital holography based on liquid crystal on silicon spatial light modulator

“…Choosing the distance between two planes is also important but is limited due to the dynamic range of the translation stage [13]. In order to decrease the acquisition time in the dual-plane method, two charge-coupled devices (CCDs) are used for recording holograms, but it increases the pre-experimental efforts in the sense of proper alignment of CCDs at two different planes because even a small alignment error of one pixel will lead to a rough result [14].…”

2-step Quadrature Phase-shifting Digital Holographic Optical Encryption using Orthogonal Polarization and Error Analysis

“…[15][16][17][18] Especially the 2-step phase-shifting interferometric technique is applied to cryptography. [19][20][21][22][23][24] In the previous papers [20,21,24], we proposed an optical encryption system using 2-step phase-shifting digital holography. In the proposed optical system, a PZT driven mirror was used to get a quadrature phase shift of π/2 in the reference beam path of the Mach-Zehnder interferometer.…”

Precise Test Sieves Calibration Method Based on Off-axis Digital Holography

“…Each pixel size of the CCD camera is Δx=Δy=4.65 µm . By using the digital reference wave concept proposed by Cuche et al [4], the object wave (amplitude and phase) has been reconstructed in the central region of the observation plane [5][6][7][8][9]. The reconstruction process has been performed using Fresnel transform [10] by selecting appropriate values for two components of wave vector, k x and k y , and the distance d between the CCD camera and the reconstruction plane.…”