Femtosecond Ablation Technique Research Articles

Fabrication and characterization of aluminum nanostructures and nanoparticles obtained using femtosecond ablation technique

In this communication we report the fabrication of nanoparticles (NPs) and nanostructures through the interaction of ultrashort laser pulses (∼40fs) with bulk aluminum immersed in chloroform and carbon tetrachloride. The size distribution and surface morphology of substrates were investigated using scanning electron microscope images. Depending on the focal position we observed sub-micron structures and nano-ripples on the irradiated surface. Picosecond nonlinear optical studies of the prepared NPs colloidal solutions using open aperture Z-scan technique demonstrated complex behavior of switching from saturable absorption to reverse saturable absorption (RSA) at lower peak intensities to pure RSA at higher peak intensities.

Fabrication of nanostructured Al 2CuMg thin film by femtosecond pulsed laser ablation

A nanostructured Al 2CuMg thin film was formed by ablating reactive arc melted targets with femtosecond (10 −15 s range) laser pulses in a high vacuum chamber (10 −6 Torr). The films were characterized by secondary electron microscopy, energy dispersive analysis of X-rays, X-ray diffraction and transmission electron microscopy. Discussion is focused on the morphology of the film produced by this technique. It was observed that the femtosecond ablation technique could be used to form nanostructured metallic thin films.