Effect of Pulse Laser Duration and Shape on PLD Thin Films Morphology and Structure

摘要: Lasers are unique energy sources characterized by spectral purity, spatial and temporal coherence, which ensure the highest incident intensity on surface of any kind sample. Each these characteristics stays at origin different applications. The study highintensity laser interaction with solid materials was started beginning era, i.e. more than 50 years ago. This called during time as: vaporization, pulverization, desorption, etching or ablation (Cheung 1994). Ablation used for first in connection lasers induction material expulsion infrared (IR) lasers. primary between IR photons takes place transitions vibration levels. plasma generated supported under action high-intensity radiation long considered as a loss channel only therefore, strong hampering development efficient processing materials. In time, it shown that controls not complex phenomena various media, but can be improving coupling ultimately (Mihailescu Hermann, 2010). fs pulses investigated optical emission spectroscopy (OES) time-of-flight mass spectrometry (TOF-MS) (Ristoscu et al., 2003; Qian 1999; Pronko Claeyssens 2002; Grojo 2005; Amoruso 2005a). ultrashort have found last applications precise machining, induced biological characterization (Dausinger 2004), also synthesis and/or transfer large class materials: diamond-like carbon (DLC) (Qian Banks Garrelie 2003), oxides (Okoshi 2000; Perriere Millon 2002), nitrides (Zhang Luculescu Geretovszky Ristoscu carbides (Ghica 2006), metals (Klini 2008) quasicrystals (Teghil 2003). Femtosecond stimulate apparition nonequilibrium states irradiated material, lead to very fast changes metastable phases. way, ablated reaches critical point control generation nanoparticles (Eliezer 2004; 2005b; Barcikowski 2007; 2007).