Effect of external feedback on lasing in random media

We have studied the effect of external feedback on random laser action in ZnO polycrystalline thin films. Reinjection of light into scattering-formed cavities strongly influences modes, intensity, and threshold of random lasers. We have compared the effect of external feedback from the side of the f...

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Bibliographic Details
Published in:Applied physics letters 1999-08, Vol.75 (9), p.1213-1215
Main Authors: Cao, H., Zhao, Y. G., Liu, X., Seelig, E. W., Chang, R. P. H.
Format: Article
Language:English
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Summary:We have studied the effect of external feedback on random laser action in ZnO polycrystalline thin films. Reinjection of light into scattering-formed cavities strongly influences modes, intensity, and threshold of random lasers. We have compared the effect of external feedback from the side of the film and that from the film surface. Our study opens the possibility of controlling random laser frequencies by external feedback.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.124645