Evanescent-wave-excited quasi-two-dimensional random lasing

Mujumdar, Sushil ; Ramachandran, Hema ; Kumar, N. ; Sood, A. K. (2006) Evanescent-wave-excited quasi-two-dimensional random lasing Optics Letters, 31 (18). pp. 2722-2724. ISSN 0146-9592

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Official URL: http://www.opticsinfobase.org/ol/abstract.cfm?URI=...

Related URL: http://dx.doi.org/10.1364/OL.31.002722

Abstract

We report on random lasing from a dye-scatterer system directly excited by evanescent modes formed over a dielectric-dielectric interface. The system is quasi-two-dimensional because of the subwavelength exponential decay of the excitation energy. Spectral narrowing by a factor of ~13 was obtained under diffusive scattering conditions. The peak intensity exhibited a unique dual-saturation behavior due to the localized nature of the excitation. We observed a reduction of threshold for samples with a higher dye concentration because of a larger excitation-state occupation number within the same interaction volume.

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Deposited On:22 Jul 2011 13:56
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