Evolution Of Periodic Structures Research Articles

Особенности структурирования и абляции тонких пленок титана фемтосекундными лазерными импульсами

The processes of structuring and ablation of a titanium film by femtosecond laser pulses at wavelengths of 515 nm and 1030 nm have been studied in both single-pulse and multi-pulse modes. The optimal energy regimes for the selective removal of film material without damaging the substrate, as well as the regimes for the generation of the periodic structures on the surface, are determined. The evolution of periodic structures with an increase in the number of laser pulses is shown. The precision removal of titanium film is associated with thermomechanical explosive boiling and the corresponding energy contribution, which ensures the cascade appearance of ablation craters.

Features of structuring and ablation of thin titanium films by femtosecond laser pulses

The processes of structuring and ablation of a titanium film by femtosecond laser pulses at wavelengths of 515 nm and 1030 nm have been studied in both single-pulse and multi-pulse modes. The optimal energy regimes for the selective removal of film material without damaging the substrate, as well as the regimes for the generation of the periodic structures on the surface, are determined. The evolution of periodic structures with an increase in the number of laser pulses is shown. The precision removal of titanium film is associated with thermomechanical explosive boiling and the corresponding energy contribution, which ensures the cascade appearance of ablation craters.. Keywords: thin films, femtosecond laser pulses, surface treatment

Evolution of periodic structures on InP (100) surface irradiated with femtosecond laser

Single crystalline InP was irradiated in air with p-polarized Ti:sapphire femtosecond laser at a fixed laser fluence of 274mJ/cm2. Ripples parallel to the laser polarization direction were found to form preferentially for small number of laser pulses ranging from 50 to 300 or at positions far from the center of laser spot, whereas grooves with the direction perpendicular to the laser polarization appeared to be superimposed on ripples for larger number of laser pulses or at positions close to the center of laser spot. Results reveal that ripple formation is a precursor for the formation of grooves and pattern evolution is dependent on the laser fluence used.