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Iterative phase-retrieval-assisted off-axis terahertz digital holography
Applied Optics
|December 25, 2019
Summary
This study introduces an iterative phase-retrieval method to enhance terahertz digital holography imaging. The technique improves reconstruction quality for off-axis holograms, overcoming recording distance limitations.
Area of Science:
- Optics and Photonics
- Imaging Science
Background:
- Off-axis configuration is optimal for non-sparse, complex objects in terahertz digital holography.
- Recording distance limitations in off-axis holography degrade imaging quality, causing low resolution or spectral overlap.
Purpose of the Study:
- To propose and validate an iterative phase-retrieval approach for improving terahertz digital hologram reconstruction.
- To overcome the imaging quality limitations associated with the recording distance in off-axis configurations.
Main Methods:
- An iterative phase-retrieval algorithm was developed.
- An additional object wave intensity capture was utilized for phase retrieval.
- Off-axis reconstruction served as the initial guess.
- Apodization was applied to suppress diffraction effects.
Main Results:
- The proposed method significantly improved image quality in terahertz digital holography.
- Both simulation and experimental verifications confirmed the enhancement in reconstruction results.
- Undesired border diffraction effects were successfully suppressed.
Conclusions:
- The iterative phase-retrieval approach effectively enhances the quality of terahertz digital holograms.
- This method provides a viable solution to the recording distance limitations in off-axis configurations.
- The technique offers improved resolution and spectral separation for complex object imaging.
