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Two-photon pumped random laser in nanocrystalline ZnO
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View: Figures


Image of FIG. 1.
FIG. 1.

Comparison of lasing emission characteristics from the same excited area of ZnO nanoparticle film for single- (∎) and two-photon (●) pumping as functions of pumping fluences: (a) lasing intensity, experimental points, and approximations; and (b) the width of lasing peak. The transitions from luminescence to lasing (solid line) and from exciton emission (dashed line) to electron-hole plasma recombination emission (dotted line) are shown. (c) Lasing peak position, whose evolution can be explained by band gap renormalization. Inset on (a) shows the narrow lasing emission peak superimposed on the broad luminescence peak. Pumping fluence was at .

Image of FIG. 2.
FIG. 2.

Experimental and theoretical nonlinear transmission curves at . The arrow indicates lasing threshold.

Image of FIG. 3.
FIG. 3.

Lasing threshold vs pumping beam radius: (∎) single-photon pumping and (●) two-photon pumping. Ordinate shows a threshold volume density of absorbed energy per pulse. , , and are single- and two-photon absorption coefficients and laser pulse duration, respectively. Fitting related to light propagation in disordered media with gain and amplified spontaneous emission shown by continuous and dashed lines, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Two-photon pumped random laser in nanocrystalline ZnO