Absorption-induced confinement of lasing modes in diffusive random medium

Details Absorption-induced confinement of lasing modes in diffusive random medium Absorption-induced confinement of lasing modes in diffusive random medium

2005-04-18

arxiv.org/abs/cond-mat/0504452v1

Optics Letters 30, 2430 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures

Scientific paper

10.1364/OL.30.002430

We present a numerical study of lasing modes in diffusive random media with local pumping. The reabsorption of emitted light suppresses the feedback from the unpumped part of the sample and effectively reduces the system size. The lasing modes are dramatically different from the quasimodes of the passive system (without gain or absorption). Even if all the quasimodes of a passive diffusive system are extended across the entire sample, the lasing modes are still confined in the pumped volume with an exponential tail outside it. The reduction of effective system volume by absorption broadens the distribution of decay rates of quasimodes and facilitates the occurrence of discrete lasing peaks.

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