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Random lasing in nanocrystalline ZnO powders

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

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.



Zugehörige Institution(en) am KIT Institut für Angewandte Physik (APH)
Publikationstyp Proceedingsbeitrag
Jahr 2010
Sprache Englisch
Identifikator ISBN: 978-0-8194-7993-8
ISSN: 0277-786X
KITopen-ID: 1000027186
Erschienen in Physics and simulation of optoelectronic devices XVIII, San Francisco, California, United States, 25 - 28 January 2010. Ed.: B. Witzigmann
Verlag SPIE, Bellingham (Wash.)
Seiten 759712
Serie Proceedings of SPIE ; 7597
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