We report on spectroscopic investigations of interaction of an expanding laser ablated plume of aluminum, zinc, graphite with ambient atmosphere of oxygen and nitrogen gas and the formation of nitrides and oxides. The ambient pressure and fluence dependence on the reactive process occurring in the ablated plume responsible for formation of oxides and nitride is discussed. Fast photography/imaging technique using ICCD is gaining importance as a diagnostic tool for understanding the dynamics of the expanding plasma plume and the gas phase nanoparticle synthesis, thus providing a novel way to understand the transportation of nanoparticles and of control of particle size. A comprehensive study done on oxide and nitrides films using pulsed laser deposition technique for possible laser oscillations in UV region of electromagnetic spectrum, in particular of ZnO will be presented. Rayleigh scattering and photoluminescence technique are used to confirm the formation of clusters in gaseous phase. The intensity of the PL emission band increases with increase in time delays of probe pulse with respect to ablating pulse, however the intensity of Zn atomic transitions decreases. The observed emission band falls in the UV spectral region of PL of ZnO, and is attributed to excitonic recombination in ZnO clusters formed in vapor phase. The clustering of grains could be the major cause of increased surface roughness of ZnO thin films deposited by PLD at high pressure. We have deposited ZnO films by PLD at moderate pressure of oxygen ambient. X-ray diffraction spectrum of film shows that grains are well oriented along c-axis. The PL profiles of films show strong UV emission band, and weak violet and green emission band.

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1. Photoluminescence properties of Aluminum oxide Nanoparticles