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Theoretical analysis for best defocus measurement plane for robust phase retrieval
Alessandro Polo1, Silvania F Pereira, Paul H Urbach
1Optics Research Group, Delft University of Technology, Delft, The Netherlands. a.polo@tudelft.nl
Optics Letters
|March 19, 2013
Summary
This study optimizes phase retrieval (PR) using through-focus intensity measurements. An optimal defocus plane is identified for accurate phase reconstruction, confirmed by experiments.
Area of Science:
- Optics and Photonics
- Image Reconstruction
Background:
- Phase retrieval (PR) is crucial for reconstructing object wavefronts.
- Conventional PR methods often require complex setups or multiple measurements.
Purpose of the Study:
- To investigate the dependence of phase retrieval on defocus distance.
- To identify an optimal measurement plane for improved PR accuracy.
Main Methods:
- Utilizing through-focus intensity measurements.
- Analyzing intensity distribution on the optical axis at varying defocus distances.
Main Results:
- An optimal measurement plane was identified where axial intensity drops to its first minimum post-focus.
- Theoretical predictions regarding PR dependence on defocus were confirmed.
- Experimental results closely matched independent phase measurements.
Conclusions:
- Through-focus intensity measurements provide a robust method for phase retrieval.
- Identifying an optimal defocus plane enhances the accuracy and reliability of PR techniques.
