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|June 11, 2026

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This study introduces a novel 3D printed micro-optical structure (3DP-µOS) for laser speckle suppression. The 3DP-µOS effectively reduces speckle by utilizing laser spectral properties and microstructures, improving image quality in laser displays.

Area of Science:

Optics and Photonics
Laser Technology
Materials Science

Background:

Laser speckle significantly degrades image quality in laser display systems.
Effective speckle suppression is essential for high-fidelity laser displays.

Purpose of the Study:

To establish a theoretical framework for speckle suppression using 3D printed micro-optical structures (3DP-µOS).
To investigate the use of spectral characteristics of multi-longitudinal-mode lasers for speckle reduction.
To analyze the design principles and limitations of 3DP-µOS for speckle suppression.

Main Methods:

Developed a theoretical model for speckle suppression based on optical path differences introduced by stepped microstructures.
Designed and fabricated 3DP-µOS with repeated arrays using 3D printing technology.

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Conducted experimental validation of the theoretical predictions for speckle reduction.

Main Results:

Experimental results demonstrated good agreement with the theoretical framework.
Identified a fundamental constraint on the number of cells in repeated arrays, related to optical path difference and sub-beam decorrelation.
Observed that speckle contrast asymptotically approaches a saturation limit beyond a certain number of cells.

Conclusions:

The 3DP-µOS provides an effective method for laser speckle suppression.
The theoretical framework accurately predicts the performance of 3DP-µOS.
The study elucidates the fundamental limits of speckle reduction achievable with repeated micro-optical structures.