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Laser induced effects on ZnO targets upon ablation at 266 and wavelengths
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Image of FIG. 1.
FIG. 1.

Raman spectra of ZnO targets irradiated at with laser fluence (a) (b) .

Image of FIG. 2.
FIG. 2.

Mapping picture of the crater produced in the ZnO target upon laser irradiation at . Near the centre of the crater laser fluence is . Raman spectra recorded scanning the crater from the outer part (upper part) toward its center (lowest part).

Image of FIG. 3.
FIG. 3.

Zn and signal intensity (obtained by integrating the Zn and mass peaks of the time-of-flight mass spectrum of the postionized plume) vs the delay between the pulses of ablation and postionization. Full squares ◼ correspond to the Zn signal; open circles ○ correspond to . (a) The ablation wavelength is . (b) The ablation wavelength is .

Image of FIG. 4.
FIG. 4.

Mass spectra of the ablation plume of ZnO targets. (a) Neutral species observed at the laser wavelengths of 266 and . (b) Positive ions observed at the laser wavelength of . (c) Positive ions at the wavelength of .


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Table I.

Frequencies and FWHM of nonirradiated ZnO targets and irradiated at ( and ).

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Table II.

Ablation of ZnO targets at 266 and . Average kinetic energies of Zn and in the plume, derived from the experimental time distributions at two different laser fluences.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Laser induced effects on ZnO targets upon ablation at 266 and 308nm wavelengths