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A novel method for identifying the order of interference using phase-shifting digital holography
T Z N Sokkar1, K A El-Farahaty1, W A Ramadan2
1Department of Physics, Faculty of Science, University of Mansoura, Mansoura, Egypt.
Journal of Microscopy
|November 21, 2015
Summary
This study presents a new mathematical method to measure large optical path length differences (OPDs) by adjusting fringe width, overcoming limitations in digital holography resolution for accurate fringe analysis.
Area of Science:
- Optical Metrology
- Holography
- Interferometry
Background:
- Measuring large optical path length differences (OPDs) is challenging with conventional methods.
- Off-axis phase-shifting digital holography is limited by hologram resolution, hindering accurate fringe order detection.
Purpose of the Study:
- To introduce a novel mathematical method for measuring large OPDs.
- To address the limitations of current digital holography techniques for OPD measurement.
Main Methods:
- A mathematical approach based on varying fringe width without altering the coherent source wavelength.
- Application and discussion of the method within off-axis phase-shifting digital holography.
Main Results:
- The proposed method effectively measures large OPDs where fringe connection is difficult.
- Demonstrated suitability for scenarios limited by hologram resolution.
Conclusions:
- The developed mathematical technique offers a robust solution for large OPD measurements.
- This method enhances the capabilities of off-axis phase-shifting digital holography.
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