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Nanochemical effects in femtosecond laser ablation of metals
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View: Figures


Image of FIG. 1.
FIG. 1.

Experimental setup for studying chemical energy released in ablation of aluminum in a chemically active ambient gas.

Image of FIG. 2.
FIG. 2.

The ratio Etot /Einc as a function of laser fluence in ablation of aluminum in oxygen, air, and argon at atmospheric pressure and in vacuum.

Image of FIG. 3.
FIG. 3.

SEM images of the sample surface. (a) A mechanically polished surface before laser irradiation. (b) and (c) A typical surface modification after 1 shot at F= 0.054 J/cm2. Surface nanodamages occur preferably on sharp edges of scratches and pits available on the sample surface before the laser irradiation. (d) The surface nanostructural pattern after 20 laser shots at F= 0.054 J/cm2.

Image of FIG. 4.
FIG. 4.

SEM image of the ablated material deposit produced around the ablation crater in argon at F = 8.7 J/cm2. The deposit consists of nanoparticles.

Image of FIG. 5.
FIG. 5.

The EDS spectra of the ablated material deposits around the ablation craters produced in argon and oxygen. The spectra show a significantly larger amount of oxygen in the deposit produced in oxygen as compared with that in argon. The oxygen mass fraction is 3.7% and 42% for argon and oxygen, respectively.

Image of FIG. 6.
FIG. 6.

The ratio of the released chemical energy to the incident laser pulse energy, Echem /Einc , as a function of laser fluence.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanochemical effects in femtosecond laser ablation of metals