Syahrun Nur Madjid, Nasrullah Idris, Koo Hendrik Kurniawan, Kiichiro Kagawa
In laser processing, suitable conditions for laser and gas play important role in ensuring a high quality of processing. To determine suitable conditions, we employed the electromagnetic phenomena associated with laser plasma generation. An electrode circuit was utilised to detect induced current due to the fast electrons propelled from the material during laser material processing. The characteristics of induced current were examined by changing parameters such as supplied voltage, laser pulse energy, number of laser shots, and type of ambient gas. These characteristics were compared with the optical emission characteristics. It was shown that the induced current technique proposed in this study is much more sensitive than the optical method in monitoring laser processing, that is to determine the precise focusing condition, and to accurately determine the moment of completion of laser beam penetration. In this study it was also shown that the induced current technique induced by CW CO2 laser can be applied in industrial material processing for monitoring the penetration completion in a stainless steel plate drilling process. © 2011 American Institute of Physics.
Department of Physics, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Banda Aceh, Indonesia; Research Center, Maju Makmur Mandiri Foundation, Jakarta 11630, 40/80 Srengseng Raya, Indonesia; Department of Physics, Faculty of Education and Regional Studies, University of Fukui, Fukui 910-8507, 9-1Bunkyo 3-chome, Japan
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