Abstract
An approach is suggested to recover and then locate the original object image in off-axis digital holography by the multiplexing of hologram (OADHM). The recording configuration is designed by introducing one more plane wave in the interference frame to carry the information for the tilt angle of the reference wave (TARW), which is crucial for the holography recovery and the accurate locating of the reconstructed image. The intensity distribution in a hologram plane and the corresponding spatial spectrum of two sets holograms in Fourier domain are analyzed theoretically. When the specific spectra that come from the interference of the two plane waves are detected, the TARW can be calculated by the coordinates of them and then the recovered image can be retrieved by spectrum operation and located at the original place. Series numerical simulations and optical experiments have been carried out to demonstrate the availability and efficiency of the proposed design.
Highlights
Benefits from the invention of laser, the technique of off-axis holography [1] can make the original image separated from other diffraction terms during hologram recovery so that the image quality is improved greatly
After the off-axis optical holography became popular in many application areas, digital holography (DH) [2,3,4,5] began to show the prosperous potential in applications and attract the interests of researchers because of its merits including the convenient processing procedure, robust signal processing capability in computer, and precise image locating in display
For off-axis DH, there exists the contradiction of the need for a largeTARW to separate the original image and the requirement of a small one to satisfy the low resolution of the recording device sensors, which limits the angle to several degrees
Summary
Benefits from the invention of laser, the technique of off-axis holography [1] can make the original image separated from other diffraction terms during hologram recovery so that the image quality is improved greatly. For off-axis DH, there exists the contradiction of the need for a largeTARW to separate the original image and the requirement of a small one to satisfy the low resolution of the recording device sensors, which limits the angle to several degrees. Such on-axis DH method as phaseshifting holography [6,7,8,9,10,11,12] can solve the problem to a certain extent, these methods need more holograms recorded to eliminate the zero-order and the twin image by interferogram calculation, which makes it difficult for dynamic recording and three-dimensional (3D). We derive the theory of the proposed method first and carry out numerical simulations and optical experiments to verify our idea before the conclusion
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