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Phys Rev Lett. 2000 Jun 12;84(24):5584-7.

Spatial confinement of laser light in active random media

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Department of Physics and Astronomy, Materials Research Center, Northwestern University, Evanston, Illinois 60208, USA.


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.

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