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Proceedings Paper

Random lasing in nanocrystalline ZnO powders
Author(s): Heinz Kalt; Janos Sartor; Felix Eilers; Johannes Fallert; Daniel Schneider; Roman J. B. Dietz; Claus Klingshirn
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Paper Abstract

We review the random-lasing properties of nanocrystalline ZnO powders. The lowest threshold for lasing occurs for average particle diameters of about 260nm. Reproducible lasing features are achieved for reduced ensemble sizes. Spatially resolved luminescence spectroscopy is used to probe directly the degree of localization of random laser modes. We find that strongly confined and extended modes can coexist in the same spatial area. However, localized modes appear for small optical gain while extended modes are only supported in the presence of large optical gain, as is expected from theory. Uniform line spacing is found in the case of extended random laser modes resulting from strong modal interactions.

Paper Details

Date Published: 25 February 2010
PDF: 9 pages
Proc. SPIE 7597, Physics and Simulation of Optoelectronic Devices XVIII, 759712 (25 February 2010); doi: 10.1117/12.847329
Show Author Affiliations
Heinz Kalt, Karlsruhe Institute of Technology (Germany)
Janos Sartor, Karlsruhe Institute of Technology (Germany)
Felix Eilers, Karlsruhe Institute of Technology (Germany)
Johannes Fallert, Karlsruhe Institute of Technology (Germany)
Daniel Schneider, Karlsruhe Institute of Technology (Germany)
Roman J. B. Dietz, Karlsruhe Institute of Technology (Germany)
Claus Klingshirn, Karlsruhe Institute of Technology (Germany)

Published in SPIE Proceedings Vol. 7597:
Physics and Simulation of Optoelectronic Devices XVIII
Bernd Witzigmann; Fritz Henneberger; Yasuhiko Arakawa; Marek Osinski, Editor(s)

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