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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Single-shot phase retrieval based on beam splitting.

Xi He, Xinchen Pan, Cheng Liu

|August 18, 2018

Summary

This summary is machine-generated.

This study introduces a novel single-shot phase retrieval technique using a Dammann grating and phase plate. The method enables rapid and accurate reconstruction of complex sample amplitude from a single diffraction pattern measurement.

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Area of Science:

Optics
Photonics
Image Reconstruction

Background:

Phase retrieval is crucial for imaging and characterization.
Traditional methods often require multiple measurements or complex setups.
Single-shot techniques offer advantages in speed and simplicity.

Purpose of the Study:

To develop a beam-splitting-based single-shot phase retrieval method.
To reconstruct the complex amplitude of a sample with high accuracy and speed.
To validate the proposed technique experimentally.

Main Methods:

Utilizing a Dammann grating to create multiple diffracted beams from the sample's transmitted field.
Employing a known, weakly scattering phase plate to process the diffracted beams.
Recording an array of isolated sub-diffraction patterns in a single measurement.
Iteratively reconstructing the complex amplitude from the recorded diffraction pattern array.

Main Results:

Successfully implemented single-shot phase retrieval using beam splitting.
Achieved accurate reconstruction of complex amplitude from a single measurement.
Demonstrated fast convergence and high accuracy due to the pre-measured phase plate.
Verified the method's feasibility through visible light experiments.

Conclusions:

The proposed Dammann grating and phase plate method is a viable approach for single-shot phase retrieval.
This technique offers a significant advancement in efficient and accurate phase imaging.
The experimental validation confirms its practical applicability in optical measurements.