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Phys Rev Lett. 2012 Jul 20;109(3):033903. Epub 2012 Jul 20.

Taming random lasers through active spatial control of the pump.

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


Active control of the spatial pump profile is proposed to exercise control over random laser emission. We demonstrate numerically the selection of any desired lasing mode from the emission spectrum. An iterative optimization method is employed, first in the regime of strong scattering where modes are spatially localized and can be easily selected using local pumping. Remarkably, this method works efficiently even in the weakly scattering regime, where strong spatial overlap of the modes precludes spatial selectivity. A complex optimized pump profile is found, which selects the desired lasing mode at the expense of others, thus demonstrating the potential of pump shaping for robust and controllable single mode operation of a random laser.

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