Influence of reference beam aberrations in digital holography on the image quality

2003 ◽  
Author(s):  
Romuald Jozwicki ◽  
Slawomir Pasko
Keyword(s):  
Image Quality ◽  
Digital Holography ◽  
Reference Beam

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.

The image quality and resolution limits of phase-shifting digital holography based on the self-imaging effect

2010 ◽  
Author(s):  
Agnieszka Siemion ◽  
Izabela Ducin ◽  
Karol Kakarenko ◽  
Michał Makowski ◽  
Andrzej Siemion ◽  
...  
Keyword(s):  
Image Quality ◽  
Digital Holography ◽  
The Self ◽  
Phase Shifting ◽  
Resolution Limits

Dual-Wavelength Digital Holography Based on Phase-Division Multiplexing Using Four Wavelength-Multiplexed Phase-Shifted Holograms and Zeroth-Order Diffraction-Image Suppression

2017 ◽  
Vol 11 (5) ◽  
pp. 806-813 ◽  
Author(s):  
Tatsuki Tahara ◽  
Reo Otani ◽  
Yasuhiko Arai ◽  
Yasuhiro Takaki ◽  
◽  
...  
Keyword(s):  
Image Quality ◽  
Intensity Ratio ◽  
Digital Holography ◽  
Averaging Method ◽  
Phase Shifting ◽  
Dual Wavelength ◽  
Diffraction Image ◽  
Zeroth Order ◽  
Incoherent Light ◽  
Order Diffraction

We propose a dual-wavelength phase-shifting digital holography technique with four wavelength-multiplexed holograms based on phase-division multiplexing utilizing the 2π ambiguity and zeroth-order diffraction-image suppression. Zeroth-order wave suppression is implemented by introducing the averaging method. Its effectiveness is experimentally shown and numerically and quantitatively investigated. The numerical investigation demonstrates the tolerance of the proposed technique against incoherent light noise and changes in the reference wave intensity. The image quality in the proposed technique depends on the intensity ratio between the object and reference waves but does not degrade with constant changes in intensity. In contrast, a previously reported four-step dual-wavelength phase-shifting technique was affected by the factors described above.

scholarly journals Image quality improvement of parallel four-step phase-shifting digital holography by using the algorithm of parallel two-step phase-shifting digital holography

2010 ◽  
Vol 18 (9) ◽  
pp. 9555 ◽  
Author(s):  
Takashi Kakue ◽  
Yuri Moritani ◽  
Kenichi Ito ◽  
Yuki Shimozato ◽  
Yasuhiro Awatsuji ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Image Quality ◽  
Digital Holography ◽  
Phase Shifting ◽  
Image Quality Improvement
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