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Modified threshold of two-photon-pumped random lasing of ZnO nanorods by femtosecond laser ablation
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10.1063/1.4752273
/content/aip/journal/jap/112/6/10.1063/1.4752273
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4752273
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

SEM image of the synthesized ZnO nanorods.

Image of FIG. 2.
FIG. 2.

(a) TPL intensity of ZnO nanorods as a function of pump energy density measured at different excitation wavelengths before fs laser ablation. (b) Wavelength dependence of the threshold of TPPRL of ZnO nanorods before fs laser ablation. Since the threshold of TPPRL at 720 nm is larger than the ablation threshold of ZnO nanorods which is estimated to be ∼38 mJ/cm2, we use 38 mJ/cm2 as the minimum threshold of TPPRL at 720 nm in order to show the sharp increase of the threshold at this wavelength.

Image of FIG. 3.
FIG. 3.

CBS cones of ZnO nanorods measured at two different wavelengths (532 and 632.8 nm). The corresponding mean free path of photons can be derived from the full width at the half maximum of the CBS cone.

Image of FIG. 4.
FIG. 4.

TPL intensity of ZnO nanorods as a function of pump energy density measured at different excitation wavelengths after fs laser ablation at 720 nm.

Image of FIG. 5.
FIG. 5.

Comparison of the TPPRL behavior of ZnO nanorods at different excitation wavelengths before and after fs laser ablation at 720 nm.

Image of FIG. 6.
FIG. 6.

Comparison of the TPPRL behavior of ZnO nanorods at different excitation wavelengths before and after fs laser ablation at the same wavelength.

Image of FIG. 7.
FIG. 7.

SEM image of ZnO nanorods after irradiation of 10 000 fs pulses with a fluence of ∼114.25 mJ/cm2.

Image of FIG. 8.
FIG. 8.

Pump energy density dependence of the TPL intensity of ZnO nanorods ablated at 660 nm (a) and 720 nm (b) with three different methods which are indicated by (i), (ii), and (iii). The total ablation time for each ablation method is chosen to be the same (60 s).

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/content/aip/journal/jap/112/6/10.1063/1.4752273
2012-09-17
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Modified threshold of two-photon-pumped random lasing of ZnO nanorods by femtosecond laser ablation
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/6/10.1063/1.4752273
10.1063/1.4752273
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