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Influence of number of laser shots on laser induced microstructures on Ag and Cu targets

Published online by Cambridge University Press:  28 January 2009

A. Latif ,
M.S. Anwar ,
M.A. Aleem ,
M.S. Rafique  and
M. Khaleeq-Ur-Rahman
A. Latif
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
M.S. Anwar*
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan Kamerlingh Onnes Laboratory, Leiden University, Leiden, The Netherlands
M.A. Aleem
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
M.S. Rafique
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
M. Khaleeq-Ur-Rahman
Affiliation:
Department of Physics, University of Engineering and Technology, Lahore, Pakistan
*
Address correspondence and reprint requests to: Muhammad Shahbaz Anwar, Kamerlingh Onnes Laboratory, Leiden University, 2333CA Leiden, The Netherlands. E-mail: anwar@physics.leidenuniv.nl
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Abstract

Annealed and fine polished Ag and Cu samples are irradiated for 25, 50, 75, and 100 shots with a Q-Switched Nd:YAG laser in air and under high vacuum ~10−6 Torr. The irradiated samples are investigated under scanning electron microscopy, which reveals the formation of laser induced ripples structures with spacing 10 µm to 25 µm. Careful analysis revealed that the ripple spacing is not only dependent on laser wavelength, target properties, but also on the number of laser shots. It is also observed that ripples spacing varies from center to edge of the thermal damage zone. Two-fold spacing is measured near the edge compared to spacing at the center of the crater. Anisotropic stresses and stress waves (shock waves) are guiding the laser induced heat energy through particular channels. Splashing cones are developed with the increase in the laser shots. More theoretical investigations are needed to study the laser ripple periodicity in the context of laser shots effect.

Keywords

Channels for heat energyLaser metal interactionRipples structure
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 1 , March 2009 , pp. 129 - 136
Copyright
Copyright © Cambridge University Press 2009

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