Effects of Focused IR Laser Pulse on Aluminum by Multi Focal Length Lens

Publication Issue: 
Volume 32, Number 1-4, 2011
Page No: 
Authors' Name: 
Ahmad Hadi Ali
Authors' Affiliation and Address: 
Department of Science and Mathematics, Faculty of Science, Technology and Human Development, Universiti Tun Hussein Onn Malaysia, Johor, Malaysia

Lasers are very important especially in research and industries. They offer directionality, high intensity, non-contact process, cleanliness and high precision. In this paper, the researcher aims to investigate the focusing effects of long pulsed IR laser on aluminum target using wide range of lenses. A Nd:YAG laser was used as an energy source. It has wavelength of 1064 nm with pulse duration 4 ns. The pulse energy delivered is 290 mJ at frequency 1 Hz and peak power of 72.5 MW. Wide ranges of biconvex lens were used to focus the laser beam on an aluminum target. A video camera was used to visualize and record the event of laser-aluminum interaction. The interaction regions on the aluminum were magnified and visualized using metallurgical microscope and then analyzed with the aid of image processing system. The image recorded during laser-aluminum interaction shows the formation of aluminum plasma plume. Experimental results show that the hole size of the aluminum is increasing as the lens focal length gets longer.

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