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Spatial confinement of laser light in active random media

Phys Rev Lett. 2000 Jun 12;84(24):5584-7. doi: 10.1103/PhysRevLett.84.5584.

Abstract

We have observed spatial confinement of laser light in micrometer-sized random media. The optical confinement is attributed to the disorder-induced scattering and interference. Our experimental data suggest that coherent amplification of the scattered light enhances the interference effect and helps the spatial confinement. Using the finite-difference time-domain method, we simulate lasing with coherent feedback in the active random medium.