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

Publication Issue: 
Volume 32, Number 1-4, 2011
Page No: 
10
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
Abstract: 

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.

Manuscript: 
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