Mujumdar, Sushil and Ramachandran, Hema and Kumar, N and Sood, AK (2006) Evanescent-wave-excited quasi-two-dimensional random lasing. In: Optics Letters, 31 (18). pp. 2722-2724.
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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 $\sim 13$ 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.
| Item Type: | Journal Article |
|---|---|
| Publication: | Optics Letters |
| Publisher: | Optical Society of America |
| Additional Information: | Copyright of this article belongs to Optical Society of America. |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 23 May 2008 |
| Last Modified: | 27 Aug 2008 13:23 |
| URI: | http://eprints.iisc.ac.in/id/eprint/14042 |
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