Generation of nano-voids inside polylactide using femtosecond laser radiation

Diverse nature of femtosecond laser ablation of poly(L-lactide) and the influence of filamentation on the polymer crystallization behaviour

“…This effect is frequently presented as the way of diffractive optical elements and waveguides fabrication. Filaments generated in water film above surface or directly in material by using microscope objectives were reported as a method of micro- and nanovoid formation inside PLLA 14,15 . In the most cases filament formation is obtained by tight focusing of femtosecond laser pulses using fixed microscope objectives or by converting Gaussian to Bessel beam 16–18 .…”

Laser Ablation of Poly(lactic acid) Sheets for the Rapid Prototyping of Sustainable, Single-Use, Disposable Medical Microcomponents

“…Pits, of approximately 20 μm diameter, were observed on the external edges of the slits (Supporting Information, section 3). We were not able to measure how deep were these pits; however they are reminiscent of nanopits reported in another publication . The absence of recast layer was observed on PLA of various crystallinity degrees (Figure E-ii,iv,v,vi).…”

“…Info 3). We were not able to measure how deep were these pits, however they are reminiscent of nanopits reported in another publication 38 . The absence of recast layer was observed on PLA of various crystallinity degrees (Figure 2 E-ii and E-iv,v,vi).…”