کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5363729 | 1388305 | 2010 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Femtosecond laser ablation of silver foil with single and double pulses
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The average ablation depth per pulse of silver foil by 130Â fs laser pulses has been measured in vacuum over a range of three orders of magnitude of pulse fluence up to 900Â JÂ cmâ2. In addition, double pulses with separations up to 3.4Â ns have been used to probe time scales of relevance for femtosecond ablation. The double pulse ablation depth, when each pulse fluence is 0.7Â JÂ cmâ2, falls to that of a single pulse as the pulse separation is increased from 0Â ps to 700Â ps. This time scale decreases to only 4Â ps as the fluence is increased to 11Â JÂ cmâ2. It then jumps to 500Â ps across a transition fluence where the slope of the ablation depth versus logarithmic fluence characteristic changes abruptly to a higher value. In addition, for pulse separations near 1000Â ps, the second pulse can cause re-deposition of ejecta from the first pulse resulting in a double pulse ablation depth only 40% that of the first pulse alone. This has important implications for the interpretation of double pulse femto-LIBS intensities. Our results suggest that the optical properties of nano or mesoparticles play a significant role in double pulse ablation with large pulse separations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 256, Issue 6, 1 January 2010, Pages 1784-1792
Journal: Applied Surface Science - Volume 256, Issue 6, 1 January 2010, Pages 1784-1792
نویسندگان
D.E. Roberts, A. du Plessis, L.R. Botha,