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Title: Dynamics of random laser and coherent backscattering of light from ZnO amplifying random medium
Authors: Sun, T.
Qiu, Z. R.
Su, Hui Min
Zhang, X. D.
Zhang, Zhao Qing
Wong, George K. L.
Wong, Kam-Sing
Keywords: I-VI semiconductors
Laser beam applications
Particle backscattering
Zinc compounds
Issue Date: Dec-2007
Citation: Applied physics letters, v. 91, 241110 (2007)
Abstract: We investigated the dynamics of coherent backscattering cone and random laser in a disordered gain medium of ZnO powder. Theoretical fit to the coherent backscattering cone yields a transport mean free path l approximately equal to the probe wavelength λ, indicating that the scattering process is in the strong scattering regime. Supernarrow emissions from the laser are accompanied by enhancement and sharpening of the coherent backscattering cone. This enhanced and sharpened backscattering cone returns to a normal profile within 10–20 ps, indicating an ultrafast gain lifetime in the medium, which is in good agreement with the time-resolved measurement of the random laser emissions.
Rights: Applied Physics Letters © copyright (2007) American Institute of Physics. The Journal's web site is located at
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