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Updated: Mar 7, 2026

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

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Speckle reduction in laser projection using microlens-array screens.

Jaël Pauwels, Guy Verschaffelt

|March 1, 2017

Summary

This summary is machine-generated.

This study introduces a new method to reduce laser speckle in projection systems using microlens arrays. By controlling light coherence on the screen, speckle formation is prevented, improving image quality.

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Last Updated: Mar 7, 2026

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Area of Science:

Optics and Photonics
Laser Technology
Materials Science

Background:

Laser-based projection systems often suffer from laser speckle, an undesirable interference pattern that degrades image quality.
Existing speckle reduction techniques can be complex or reduce overall image brightness.

Purpose of the Study:

To develop and evaluate a novel speckle reduction scheme for laser projection systems.
To investigate the use of microlens arrays as a screen material for speckle reduction.

Main Methods:

Utilized microlens arrays with varying structures and lens sizes as screen materials.
Adjusted the spatial coherence of the laser beam using a rotating diffuser.
Measured and modeled speckle contrast and reduction on microlens array and paper screens.

Main Results:

Demonstrated significant speckle reduction by ensuring the coherence area on the microlens-array screen is smaller than the microlens footprint.
Identified key mechanisms influencing speckle contrast.
Compared performance against a traditional paper screen.

Conclusions:

Microlens arrays offer a viable solution for laser speckle reduction in projection systems.
Controlling light coherence properties on the screen is crucial for effective speckle mitigation.
Potential limitations include increased non-uniformity in the projected image.