Effect of external feedback on lasing in random media

H. Cao*, Y. G. Zhao, X. Liu, E. W. Seelig, R. P.H. Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)1213-1215
Number of pages3
JournalApplied Physics Letters
Issue number9
StatePublished - Aug 30 1999

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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