We review our recent work on lasing in active random media. Light scattering, which had been regarded detrimental to lasing action for a long time, actually provided coherent feedback for lasing. We also trapped laser light in micrometer-sized random media. The trapping was caused by disorder-induced scattering and inference. This nontraditional way of light confinement has important application to microlasers. The threshold of random laser can be reduced by incorporating some degree of order into an active random medium. Our calculation result shows that by optimizing the degree of order one can dramatically reduce the threshold of random laser to the values comparable to those of photonic bandgap defect lasers.

Date Published: 2 August 2004
PDF: 10 pages
Proc. SPIE 5508, Complex Mediums V: Light and Complexity, (2 August 2004); doi: 10.1117/12.559047

Published in SPIE Proceedings Vol. 5508:
Complex Mediums V: Light and Complexity
Martin W. McCall; Graeme Dewar, Editor(s)