4 documents found, page 1 of 1
Surface treatment of CFRP composites using femtosecond laser radiation
Oliveira, Vitor; Sharma, S. P.; de Moura, M. F. S. F.; Moreira, R. D. F.; Vilar, R.In the present work, we investigate the surface treatment of carbon fiber-reinforced polymer (CFRP) composites by laser ablation with femtosecond laser radiation. For this purpose, unidirectional carbon fiber-reinforced epoxy matrix composites were treated with femtosecond laser pulses of 1024 nm wavelength and 550 fs duration. Laser tracks were inscribed on the material surface using pulse energies and scannin...
Morphology and structure of particles produced by femtosecond laser ablation of...
Sharma, S. P.; Oliveira, Vitor; Vilar, RuiThe aim of the present work was to study the morphology and structure of the nanoparticles produced by femtosecond laser ablation of fused silica. Ultrashort laser pulses of 1030 nm wavelength and 550 fs duration were tightly focused by a high numerical aperture microscope objective at the surface of fused silica samples while scanning the sample in relation to the stationary laser beam. Laser tracks were creat...
Internal structure of the nanogratings generated inside bulk fused sílica by ul...
Sharma, S. P.; Oliveira, Vitor; Herrero, P.; Vilar, R.The aim of the present work was to characterize the internal structure of nanogratings generated inside bulk fused silica by ultrafast laser processing and to study the influence of diluted hydrofluoric acid etching on their structure. The nanogratings were inscribed at a depth of 100 mu m within fused silica wafers by a direct writing method, using 1030 nm radiation wavelength and the following processing para...
Surface morphology and phase transformations of femtosecond laser-processed sap...
Vilar, R.; Sharma, S. P.; Almeida, A.; Cangueiro, L. T.; Oliveira, VitorThe morphological and structural modifications induced in sapphire by surface treatment with femtosecond laser radiation were studied. Single-crystal sapphire wafers cut parallel to the (0 1 2) planes were treated with 560 fs, 1030 nm wavelength laser radiation using wide ranges of pulse energy and repetition rate. Self-ordered periodic structures with an average spatial periodicity of similar to 300 nm were ob...