Random laser action in semiconductor powder

H. Cao, Y. G. Zhao, S. T. Ho, E. W. Seelig, Q. H. Wang, R. P.H. Chang

Research output: Contribution to journalArticlepeer-review

1481 Citations (Scopus)


We report the first observation of random laser action with coherent feedback in semiconductor powder. Since the scattering mean free path is less than the emission wavelength, recurrent light scattering arises and provides coherent feedback for lasing. Discrete lasing modes have been observed above the threshold. The dependence of the lasing threshold intensity on the excitation volume agrees with the random laser theory. Laser emission from the powder could be observed in all directions. This observation also provides direct evidence for the existence of recurrent scattering of light.

Original languageEnglish
Pages (from-to)2278-2281
Number of pages4
JournalPhysical review letters
Issue number11
Publication statusPublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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