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- W2161279747 abstract "We investigated systematically the modification of the two-photon-pumped random lasing (TPPRL) behavior of ZnO nanorods through femtosecond (fs) laser ablation. The excitation wavelength dependence of the TPPRL behavior of ZnO nanorods was measured and the threshold of TPPRL before and after fs laser ablation was compared. With increasing excitation wavelength, a rapid increase in the threshold of TPPRL was observed at ∼720 nm and it offers us the opportunity to significantly modify the two-photon luminescence from ZnO nanorods by fs laser ablation. The excitation wavelength dependence of the threshold was attributed to the wavelength dependence of the mean free path of photons in ZnO nanorods. When the fs laser ablation was carried out at 720 nm, it was found that the improvement in TPPRL could be achieved at excitation wavelengths longer than 620 nm while the TPPRL behavior became deteriorated for excitation wavelengths shorter than 620 nm. If the ablation and characterization wavelengths were chosen to be the same, then no obvious change was found for wavelengths shorter than 680 nm. However, a significant improvement in TPPRL could still be observed at 720 nm. The effects of ablation time and ablation method on the TPPRL behavior were also studied. It was revealed that the reduction in the threshold and the enhancement in the internal quantum efficiency could be realized by increasing ablation time and using continuous ablation. The results presented in this paper will be useful for the modification of the TPPRL behavior of random lasing media." @default.
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- W2161279747 date "2012-09-15" @default.
- W2161279747 modified "2023-09-29" @default.
- W2161279747 title "Modified threshold of two-photon-pumped random lasing of ZnO nanorods by femtosecond laser ablation" @default.
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- W2161279747 doi "https://doi.org/10.1063/1.4752273" @default.
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