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Imaging through opacity using a near-infrared low-spatial-coherence fiber light source.

Rui Ma, Zhao Wang, Hua Hui Zhang

|July 8, 2020

Summary

Researchers developed a novel all-fiber low-spatial-coherence light source for advanced imaging through scattering media. This technique enhances imaging efficiency and depth, enabling object orientation identification.

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Area of Science:

Optics
Biomedical Imaging
Laser Physics

Background:

Memory-effect-based speckle correlation is crucial for imaging through scattering media.
Low spatial coherence light sources are essential for this technique.
Traditional methods often use rotating diffusers for spatial decoherence.

Purpose of the Study:

To propose and demonstrate an all-fiber-based low-spatial-coherence light source.
To simplify illumination structures and enhance light efficiency for speckle-correlated imaging.
To extend the light source to the near-infrared band for improved imaging performance.

Main Methods:

Development of an all-fiber low-spatial-coherence light source.
Utilizing a multimode random fiber laser.
Implementation of a local illumination method.

Main Results:

Simplified illumination structure and enhanced light efficiency.
Extended wavelength to the near-infrared band, improving memory effect range and penetration depth.
Successful identification of object orientation, a novel capability.

Conclusions:

The proposed all-fiber light source offers a practical and efficient solution for speckle-correlated imaging.
The near-infrared extension and local illumination method advance capabilities in optical biomedical imaging.
This work broadens the applications of multimode random fiber lasers in scattering media imaging.