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Title of article :
Extended measurement of crater depths for aluminum and copper at high irradiances by nanosecond visible laser pulses
Author/Authors :
Ardian B. Gojani، نويسنده , , Jack J. Yoh، نويسنده , , Jong H. Yoo، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
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Abstract :
The effects of high power laser on aluminum and copper targets are investigated experimentally. Shadowgraph imagining is used to observe the expulsion of the material, plasma-plume formation and shock wave generation. Confocal microscopy is used for crater depth analysis, which showed that two distinctive regimes exist. At irradiances lower than 1011 W/cm2 the crater depth increases monotonically with the increase of irradiation. At higher irradiances, crater depth of aluminum reaches a limit value while in the case of copper, the crater depth decreases between 1011 and 2 × 1012 W/cm2, and then increases again. The present results clarify the effect of plasma shielding on limiting crater depths by providing first time measurements for metals at high irradiance regime.
Keywords :
Laser , Ablation , Phase explosion , Shock wave , Plasma
Journal title :
Applied Surface Science
Serial Year :
Link To Document :