Polarization analysis with digital holography by use of polarization modulation for single reference beam

2007 ◽  
Vol 46 (5) ◽  
pp. 055801 ◽  
Author(s):  
Masayuki Yokota
Keyword(s):  
Digital Holography ◽  
Reference Beam ◽  
Polarization Modulation ◽  
Polarization Analysis

Phase-shifting digital holography with an unknown reference beam

2021 ◽  
Author(s):  
Roghayeh Yazdani ◽  
Hamidreza Fallah
Keyword(s):  
Digital Holography ◽  
Phase Retrieval ◽  
Reference Beam ◽  
Phase Shifting ◽  
Retrieval Algorithm ◽  
Reference Field ◽  
Digital Holograms ◽  
Noisy Conditions ◽  
Phase Retrieval Algorithm

In digital holography, errors of the reference field degrade the quality of the reconstructed object field. In this paper, we propose an effective method in phase-shifting digital holography in which the reference field does not need to be known and perfect. The unknown complex amplitudes of both reference and object fields are derived simultaneously. The method employs only five digital holograms and a single execution of a phase retrieval algorithm. So, the required measurements and algorithm executions in this method are fewer than those in other methods; it suggests a simpler and faster method. The effectiveness of the suggested method is indicated by simulation, under noise-free and noisy conditions. Moreover, the capability of the method to extract full information about the phase singularities in both fields is demonstrated.

Phase-Shifting Method with Unknown Intervals in Phase-Shifting Digital Holography

2006 ◽  
Vol 3-4 ◽  
pp. 211-216
Author(s):  
T. Kita ◽  
Yoshiharu Morimoto ◽  
Motoharu Fujigaki ◽  
Toru Matui
Keyword(s):  
Phase Shift ◽  
Intensity Distribution ◽  
Digital Holography ◽  
Phase Distribution ◽  
Reference Beam ◽  
Spherical Wave ◽  
High Accuracy ◽  
Displacement Measurement ◽  
Phase Shifting ◽  
Phase Shifting Method

Displacement measurement can be performed with high accuracy using phase-shifting method. In phase-shifting method, it is often used four steps of phase-shifting for one cycle. In conventional method, to measure the displacement of an object by an interferometer, the phase of a reference beam should be shifted by every π/2 in the four-step phase-shifting. In this paper, a phase-shifting method with unknown intervals is proposed. This method does not need to shift a phase by every π/2. It can detect an intensity distribution and a phase distribution from five fringe images with equal intervals even if the phase-shift amount is unknown. Using this method, we propose a displacement measurement of phase-shifting digital holographic interferometry using spherical wave as reference wave.

Formulation of off-axis single reference beam and two angle views for digital holography

2010 ◽  
Vol 12 (3) ◽  
pp. 035302 ◽  
Author(s):  
Sebti Boucherit ◽  
Larbi Bouamama ◽  
Rabah Zegadi ◽  
Serge Simoëns
Keyword(s):  
Digital Holography ◽  
Reference Beam

scholarly journals Latest Advances in Single and Multiwavelength Digital Holography and Holographic Microscopy

2020 ◽  
Author(s):  
George Nehmetallah ◽  
Logan Williams ◽  
Thanh Nguyen
Keyword(s):  
Digital Holography ◽  
Spherical Aberration ◽  
Reference Beam ◽  
Digital Holographic Microscopy ◽  
Reconstruction Algorithms ◽  
Post Processing ◽  
Transmission Modes ◽  
Multi Wavelength ◽  
Holographic Microscopy ◽  
Phase Curvature

In this Chapter, we discuss the latest advances in digital holography (DH) and digital holographic microscopy (DHM). Specifically, we study the different setup configurations such as single and multiwavelength approaches in reflection and transmission modes and the reconstruction algorithms used. We also propose two novel telecentric recording configurations for single and multi-wavelength digital holographic microscopy (TMW-DHM) systems. Brief theory and results are shown for each of the experimental setups discussed. The advantages and disadvantages of the different configurations will be studied in details. Typical configuration features are, ease of phase reconstruction, speed, vertical measurement range without phase ambiguity, difficulty in applying optical and numerical post-processing aberration compensation methods. Aberrations can be due to: (a) misalignment, (b) multiwavelength method resulting in Chromatic aberrations, (c) the MO resulting in parabolic phase curvature, (d) the angle of the reference beam resulting in linear phase distortions, and (e) different optical components used in the setup, such as spherical aberration, astigmatism, coma, and distortion. We conclude that telecentric configuration eliminates the need of extensive digital automatic aberration compensation or the need for a second hologram’s phase to be used to obtain the object phase map through subtraction. We also conclude that without a telecentric setup and even with post-processing a residual phase remains to perturb the measurement. Finally, a custom developed user-friendly graphical user interface (GUI) software is employed to automate the reconstruction processes for all configurations.

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