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Random lasers with coherent feedback

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7 Author(s)
Cao, Hui ; Mater. Res. Center, Northwestern Univ., Evanston, IL, USA ; Xu, J.Y. ; Yong Ling ; Burin, A.L.
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We review our recent work on lasing in active random media. Light scattering, which had been regarded as detrimental to lasing action for a long time, actually provided coherent feedback for lasing. The fundamental difference and transition between a random laser with coherent feedback and a random laser with incoherent feedback were illustrated. We also trapped laser light in micrometer-sized random media. The trapping was caused by disorder-induced scattering and interference. This nontraditional way of light confinement has important applications to microlasers.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:9 ,  Issue: 1 )