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Taming random lasers through active spatial control of the pump.

N Bachelard¹, J Andreasen, S Gigan

¹Institut Langevin, ESPCI ParisTech CNRS UMR7587, 1, rue Jussieu, 75238 Paris Cedex 05, France.

Physical Review Letters

|August 7, 2012

Summary

Researchers demonstrate active control over random laser emission by optimizing the spatial pump profile. This method enables selection of specific lasing modes, even in complex scattering conditions, for robust single-mode operation.

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Area of Science:

Photonics and Laser Physics
Wave Scattering Phenomena
Computational Physics

Background:

Random lasers exhibit complex emission spectra due to strong scattering.
Controlling the spatial pump profile is a potential method for mode selection.
Existing methods struggle with mode selectivity in weakly scattering regimes.

Purpose of the Study:

To demonstrate numerical control over random laser emission using active spatial pump profiling.
To achieve selection of desired lasing modes from the emission spectrum.
To investigate the efficacy of pump shaping in both strong and weak scattering regimes.

Main Methods:

Numerical simulations of random laser emission.
An iterative optimization method to tailor the spatial pump profile.

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Analysis of mode localization and spatial overlap in different scattering regimes.

Main Results:

Successful selection of any desired lasing mode was demonstrated numerically.
The iterative optimization method proved effective in strong scattering conditions.
Remarkably, the method also succeeded in the weakly scattering regime, overcoming spatial mode overlap issues.

Conclusions:

Optimized spatial pump profiles can effectively control random laser emission.
Pump shaping offers a robust pathway to achieve controllable single-mode operation in random lasers.
This technique holds significant potential for advanced laser applications requiring precise mode control.