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Coherent backscattering from high-gain scattering media.

P C de Oliveira, A E Perkins, N M Lawandy

|November 3, 2009

Summary

This summary is machine-generated.

We observed coherent backscattering in high-gain scattering media. Increasing light amplification narrowed the backscattering cone width without changing the enhancement factor.

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Area of Science:

Optics
Condensed Matter Physics
Materials Science

Background:

Coherent backscattering (CBS) is a wave phenomenon resulting from constructive interference of time-reversed light paths.
In scattering media, CBS exhibits a characteristic cone shape with an intensity enhancement factor of approximately 2.
High-gain scattering media exhibit light amplification, which can significantly alter wave propagation and interference phenomena.

Purpose of the Study:

To experimentally investigate the effect of significant light amplification on coherent backscattering signals.
To explore the interplay between gain and scattering in determining the CBS cone characteristics.
To understand how amplification influences the enhancement factor and cone width in scattering media.

Main Methods:

Fabrication of polymer sheets doped with optically pumped dyes as the gain medium.
Incorporation of titanium dioxide (TiO2) nanoparticles to provide light scattering.
Measurement of coherent backscattering profiles under varying optical pump intensities to control amplification.

Main Results:

Observation of coherent backscattering signals in a high-gain scattering regime where amplification occurs over one transport length.
Experimental evidence that the width of the coherent backscattering cone narrows as amplification increases.
Demonstration that the CBS enhancement factor remains largely unchanged despite increasing gain.

Conclusions:

Significant light amplification in scattering media modifies the coherent backscattering cone width.
The enhancement factor of coherent backscattering is robust against changes in amplification in this regime.
These findings provide insights into wave transport and interference in active scattering systems.