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Updated: Jun 1, 2026

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

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

Published on: January 28, 2019

Phase mapping and wavefront analysis based on multi-illumination light fields generated by a spatial light modulator.

Alexandre Mazine¹, Kevin Heggarty

¹Institut Telecom, Telecom Bretagne, Départment d’Optique, Technopôle Brest-Iroise, CS 83818, 29238 Brest, France.

|June 16, 2011

Summary

This summary is machine-generated.

This study introduces a novel multi-illumination method for mapping unknown phase objects and wavefronts using diffraction patterns. The technique offers faster convergence and avoids local minima, improving phase retrieval accuracy.

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Area of Science:

Optics and Photonics
Wavefront Sensing
Phase Retrieval

Background:

Determining phase maps of optical objects and wavefronts is crucial in various scientific fields.
Existing diffraction-pattern-based methods often suffer from slow convergence and convergence to local minima.

Purpose of the Study:

To develop a new multi-illumination technique for accurate phase map determination of unknown phase objects and wavefronts.
To improve the speed and robustness of phase retrieval algorithms.

Main Methods:

Utilizing a spatial light modulator to generate multiple probe-light fields illuminating the object.
Employing a motionless multi-view operation and an enhanced deconvolution algorithm for diffraction pattern analysis.
Validating the technique through computer simulations and experimental reconstructions.

Main Results:

The multi-illumination approach significantly accelerates deconvolution algorithm convergence (tens vs. hundreds of iterations).
Additional information from diverse diffraction patterns prevents convergence to spurious local minima, enhancing accuracy.
Experimental validation with test targets confirms the technique's feasibility using low-cost components.

Conclusions:

The proposed multi-illumination technique provides a faster and more robust method for phase map determination.
The technique is feasible, cost-effective, and has potential for multiresolution wavefront analysis.
Identified error sources and proposed solutions pave the way for further advancements.