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Phase singularity reduction in speckle interferometry by tailoring the spatial coherence of light
Applied Optics
|October 6, 2021
Summary
Reducing phase singularities in speckle interferometry improves phase deconvolution quality. This is achieved by controlling light source spatial coherence, which alters speckle patterns for clearer fringe systems.
Area of Science:
- Optical metrology
- Interferometry
- Speckle analysis
Background:
- Phase singularities in speckle interferometry degrade phase deconvolution and fringe system separability.
- Highly dynamic fringe systems are particularly susceptible to these quality reductions.
Purpose of the Study:
- To physically reduce phase singularities in speckle interferometry.
- To enhance phase deconvolution and fringe system separability, especially in dynamic scenarios.
Main Methods:
- Tailoring the spatial coherence of the light source at the interferometer's entrance.
- Utilizing a Michelson-Mach-Zehnder interferometer hybrid for experimental validation.
- Employing theoretical explanations and simulations to understand the reduction mechanism.
Main Results:
- Demonstrated a quantifiable reduction in phase singularities.
- Showcased how tailored spatial coherence alters speckle pattern size and position.
- Validated the non-intuitive reduction mechanism through experimental results.
Conclusions:
- Physical reduction of phase singularities is achievable by controlling light source coherence.
- This method significantly enhances the quality of phase deconvolution and fringe separability.
- The findings offer a novel approach for improving speckle interferometry performance.
