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Speckle reduction using deformable mirrors with diffusers in a laser pico-projector.

Hsuan-An Chen, Jui-Wen Pan, Zu-Po Yang

|August 10, 2017

Summary

This summary is machine-generated.

This study introduces a novel laser pico-projector design using diffusers and deformable mirrors to significantly reduce laser speckle noise. The optimized design achieves speckle contrast values invisible to the human eye.

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Area of Science:

Optics and Photonics
Image Processing

Background:

Laser pico-projectors suffer from speckle noise, degrading image quality.
Speckle reduction is crucial for enhancing visual experience in projection technology.

Purpose of the Study:

To design and evaluate a laser pico-projector system for effective speckle reduction.
To investigate the impact of diffuser divergence angles and deformable mirrors on speckle suppression.

Main Methods:

Utilizing diffusers with varying divergence angles to control light scattering.
Incorporating deformable mirrors to dynamically adjust wavefronts and further reduce speckle.
Comparing three diffuser designs: circular symmetric, elliptical distribution, and a combined approach.

Main Results:

Speckle contrast values were reduced below 0.05 for all tested diffuser types.
Type 1 (circular symmetric diffuser) achieved a speckle contrast of 0.0264.
Type 3 (combined circular and elliptical diffusers) yielded the lowest speckle contrast at 0.0236.
The combined diffuser approach with a deformable mirror demonstrated superior speckle reduction.

Conclusions:

The proposed design effectively suppresses laser speckle in pico-projectors.
Speckle contrast values below 0.05 render the speckle phenomenon imperceptible to the human eye.
The combination of diffusers and deformable mirrors offers a viable solution for high-quality laser projection.