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Related Experiment Video

Updated: Jan 5, 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

Rapid laser solver for the phase retrieval problem.

C Tradonsky¹, I Gershenzon¹, V Pal^1,2

¹Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.

Science Advances

|October 18, 2019

Summary

This summary is machine-generated.

Researchers developed a novel optical method using a digital degenerate cavity laser to solve the phase retrieval problem. This physical system rapidly reconstructs objects from scattered light, offering an efficient alternative to slow iterative algorithms.

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Area of Science:

Physics
Computational Imaging
Optics

Background:

Phase retrieval is crucial for applications like X-ray imaging and astrophysics.
Current indirect iterative algorithms for phase retrieval are slow and inefficient.
Direct reconstruction methods for phase retrieval are lacking.

Purpose of the Study:

To present a novel optical approach for rapid and efficient phase retrieval.
To demonstrate a physical system capable of solving the phase retrieval problem.
To explore the potential of tailored physical systems for computational challenges.

Main Methods:

Utilized a digital degenerate cavity laser system.
Leveraged the most probable lasing mode for object reconstruction.
Investigated gain competition between lasing modes as a parallel computing mechanism.

Main Results:

Successfully reconstructed objects from scattered intensity distributions.
Demonstrated rapid and efficient phase retrieval using the optical approach.
Experimental results suggest the system acts as a highly parallel computer.

Conclusions:

The digital degenerate cavity laser offers a fast and efficient solution for the phase retrieval problem.
This physical computing approach can be generalized to imaging through scattering media and other complex computational tasks.
Gain competition in lasing modes provides a powerful mechanism for solving inverse problems.