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Abstract
The micro structural morphological investigations of the laser exposed samples of Platinum are presented. Q-Switched Nd: YAG laser (1064 nm, 1.1 MW, 9 - 14 ns) represented by Gaussian profile, power density 3 × 1015 Watt/m2 and focal spot size 12 um is used to irradiate the targets (4 N, 1 × 1 × 0.3 cm3). Surface modifications are observed and examined for optimized 50 pulses in air (1 atm) as well as under vacuum (~10–3 torr) by analyzing SEM micrographs. Ripples, cones, crater and hillocks formation, splashing, sputtering, solidification and redeposition are observed as main modifications at the irradiated surface. It is explored that material is ejected with explosive expel. Motic digital microscope is used for the measurements of ablated micron sized droplets. The average distance between the adjacent cones is larger near the crater region. Topographical changes are characterized applying Atomic Force Microscopy. RMS surface roughness, hillocks and crater sizes on the irradiated surfaces are also calculated. The structural analysis is mainly focused on measurements of grain sizes, diffracted X-Rays intensity and interplanar distance. The results thus obtained determine that IR radiations are unable to change interplanar distance of the target where as changes in diffracted x-rays intensity and grain sizes for irradiated platinum are noticed.
Highlights
Pulsed laser irradiation of solids is a unique way for the perturbation of materials away from the equilibrium [1,2,3]
The structural analysis is mainly focused on measurements of grain sizes, diffracted X-Rays intensity and interplanar distance
Non-uniform heat conduction occurs in laser platinum interaction
Summary
Pulsed laser irradiation of solids is a unique way for the perturbation of materials away from the equilibrium [1,2,3]. The ablative effects normally appear in the form of melting, evaporation, overheating and explosive boiling of the target surface. The conversion of electromagnetic energy initiates electronic excitation and appears in the form of thermal, chemical and mechanical energy to cause evaporation, ablation, excitation and plasma formation [4].This requires a precise control of the properties of both the ablated material (yield, stichometry, size distribution) and the remaining sample (ablation depth, crater profile) for micromachining setting [5]. The different aspects of surface and structural studies of irradiated metals in nano regime have been performed by various working scientists [6,7,8,9,10,11,12]. We have explored, investigated and performed a more detailed analysis for structural, morphological and topographical changes occurring due to radiation effects on the Platinum targets
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