26 June 2001 Time-resolved measurement of ablation from ns-laser-heated aluminum and comparison with simulation
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Proceedings Volume 4423, Nonresonant Laser-Matter Interaction (NLMI-10); (2001) https://doi.org/10.1117/12.431218
Event: Nonresonant Laser-Matter Interaction (NLMI-10), 2000, St. Petersburg, Russian Federation
Abstract
An experimental and numerical study was conducted on ablation form ns-laser heated aluminum. The goal of present study is to clarify the laser ablation phenomena. In experiments, a YAG laser of 650mJ in 4-7nsec was used to perpendicularly illuminate an aluminum target. Time-resolved measurements were conducted using high-speed camera system. Also, a numerical simulation was conducted using CIP method. The experimental results of time-resolved measurements indicate that the target surface itself is melting until late after the laser irradiation. The SEM pictures of the irradiated indicate that the target surface itself is melting until late after the laser irradiation. The SEM pictures of the irradiated target surface are showing the generation of many minute protrusions. These protrusions near the part that laser is irradiated are facing toward the laser beam path and those of the surroundings are facing toward circumference. It is found by numerical simulation that this is due to the appearance of the critical point just after the laser irradiation. Since the laser beam goes around the critical point, the damaged part expands toward circumference.
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Masato Watanabe, Masato Watanabe, Eiki Hotta, Eiki Hotta, Takashi Yabe, Takashi Yabe, } "Time-resolved measurement of ablation from ns-laser-heated aluminum and comparison with simulation", Proc. SPIE 4423, Nonresonant Laser-Matter Interaction (NLMI-10), (26 June 2001); doi: 10.1117/12.431218; https://doi.org/10.1117/12.431218
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