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(Color online) (a) Photoexcitation emission spectra of ZnO/Al2O3 nanopowders with various values of the weight fraction fw . Excitation power density is 1450 kW/cm2. (b)–(e) Histograms of the number of spike-like lasing peaks vs. lasing wavelength for various values of fw .
(Color online) (a) Mean of the peak lasing wavelength as a function of the weight fraction of fw (solid squares, left axis). The solid curve is the plot of the inverse of the calculated photon-transport mean free path lmf (right axis) vs. fw . Inset shows the absorbance spectrum of ZnO nanopowders. (b) Peak wavelength in ZnO/Al2O3 emission spectra as a function of fw when theexcitation power is substantially below the lasing threshold power (∼100 kW/cm2). The inset shows examples of the emission spectra for fw = 0 and 20.
(Color online) (a) Integrated lasing intensity of ZnO/Al2O3 nanopowders as a function of excitation power density for various fw . (b) Threshold power density Pth as a function of lmf (solid squares). The solid line represents the best-fit result given by the equation .
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