Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53121#.VLXOVsnQrzE Author(s) Shahbaz Ahmad , Shazia Bashir , Daniel Yousaf , Nisar Ali , Tousif Hussain Affiliation(s) Center for Advanced Studies in Physics, Government College University, Lahore, Pakistan . ABSTRACT Brass targets were irradiated with various laser pulses of Excimer laser ranging from 1200 to 3000 for constant fluence of 3.4 J/cm 2 in oxygen atmosphere (100 Torr). The surface morphology and crystallographic analyses were performed by using Scanning Electron Microscope (SEM) and X-Ray Diffractometer (XRD). SEM analysis reveals the formation of laser-induced micro-sized cavities, bumps, cones and wave-like ridges with non-uniform shape and density distribution. These features are formed for all number of pulses; however with increasing number of pulses from 1200 to 2400, the density of cavities decreases whereas, the wave-like ridg...
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