Random laser action in semiconductor powder

  title={Random laser action in semiconductor powder},
  author={Hui Cao and Y. G. Zhao and Seng Tiong Ho and E. W. Seelig and Qing Hua Wang and R. P. H. Chang},
  journal={Physical Review Letters},
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… 

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