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Random Lasing in Nanocrystalline ZnO Powders

Kalt, H.; Fallert, J.; Dietz, R.J.B.; Sartor, J.; Schneider, D.; Klingshirn, C.

We investigate the properties of random lasing in nanocrystalline ZnO powders. The lowest threshold for lasing occurs for average particle diameters of about 260 nm. 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 mode. We find that strongly confined and extended modes can co-exist 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. Localized and extended random-laser modes co-exist in space but appear in spectral regions of low and high optical gain, respectively.

DOI: 10.1002/pssb.200983268
Zitationen: 7
Web of Science
Zitationen: 8
Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Publikationstyp Zeitschriftenaufsatz
Jahr 2010
Sprache Englisch
Identifikator ISSN: 0370-1972
KITopen-ID: 1000027183
Erschienen in Physica Status Solidi (B)
Band 247
Heft 6
Seiten 1448 - 1452
Nachgewiesen in Web of Science
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