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Picosecond laser ablation of poly-L-lactide: Effect of crystallinity on the material response
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10.1063/1.3653964
/content/aip/journal/jap/110/9/10.1063/1.3653964
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/9/10.1063/1.3653964
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) SEM images corresponding to single-shot craters at a wavelength of 532 nm for quasi-amorphous PLLA at different energies: E = 26 μJ (a); E = 51.6 μJ (b).

Image of FIG. 2.
FIG. 2.

Data analysis of single pulse craters produce by 10 ps pulses at a wavelength of 532 nm on amorphous PLLA. The graphs show the squared diameter of the craters measured by profilometry (a) and the etch depth per pulse (b) as a function of the pulse energy. Lines in Figures 2(a) and 2(b) indicate the fitting curves to Eqs. (1) and (2), respectively.

Image of FIG. 3.
FIG. 3.

(Color online) SEM images corresponding to single-shot craters at a wavelength of 355 nm for amorphous PLLA at different energies: (a) E = 42.0 μJ; (b) E = 66.7 μJ.

Image of FIG. 4.
FIG. 4.

(Color online) SEM images corresponding to single-shot craters at a wavelength of 532 nm for PLLA films of 33% (a, b) and 49% (c, d) crystallinity degree at different pulse energies: (a) E = 19.1 μJ, (b) E = 83.3 μJ, (c) = 9 μJ, and (d) E = 93.5 μJ.

Image of FIG. 5.
FIG. 5.

(Color online) SEM images corresponding to single-shot craters at a wavelength of 355 nm for high crystalline PLLA at different energies: (a) E = 8.4 μJ; (b) E = 24.1 μJ.

Image of FIG. 6.
FIG. 6.

Crater square diameter as a function of the incident laser energy and wavelength for PLLA of high crystallinity degree (Xc = 49%). The solid and dashed lines represent the best fits according to Eq. (1) in the low and high energy regimes.

Image of FIG. 7.
FIG. 7.

Ablation depth d as a function of the incident laser energy and wavelength for PLLA of high crystallinity degree (open triangles: λ = 355 nm and closed squares: λ = 532 nm). The solid line represents the best fit for the experimental data according to Eq. (2) (for λ = 532 nm).

Image of FIG. 8.
FIG. 8.

(Color online) SEM images corresponding to grooves machined by laser pulse overlapping (σ0 = 10 μm, f = 250 kHz, v = 600 mm/s) in PLLA at different pulse energy: (a) E = 6.04 μJ, (b) E = 14.44 μJ.

Image of FIG. 9.
FIG. 9.

(a) Topographic profiles corresponding to the laser grooves (σ0 = 10 μm, f = 250 kHz, v = 600 mm/s) at a wavelength of 355 nm and two different pulse energies (solid line: E = 7.2 μJ, dashed line: E = 12.2 μJ. The dotted line represents the level plane). (b) Evolution of line depth (squares), width (circles), and height of the recast layers (triangles) with increasing pulse energy.

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/content/aip/journal/jap/110/9/10.1063/1.3653964
2011-11-04
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Picosecond laser ablation of poly-L-lactide: Effect of crystallinity on the material response
http://aip.metastore.ingenta.com/content/aip/journal/jap/110/9/10.1063/1.3653964
10.1063/1.3653964
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