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Femtosecond laser ablation of silver foil with single and double pulses
The average ablation depth per pulse of silver foil by 130 fs laser pulses has been measured in vacuum over a range of three orders of magnitude of pulse fluence up to 900 J cm −2. In addition, double pulses with separations up to 3.4 ns have been used to probe time scales of relevance for femtoseco...
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Published in: | Applied surface science 2010, Vol.256 (6), p.1784-1792 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The average ablation depth per pulse of silver foil by 130
fs laser pulses has been measured in vacuum over a range of three orders of magnitude of pulse fluence up to 900
J
cm
−2. In addition, double pulses with separations up to 3.4
ns have been used to probe time scales of relevance for femtosecond ablation. The double pulse ablation depth, when each pulse fluence is 0.7
J
cm
−2, falls to that of a single pulse as the pulse separation is increased from 0
ps to 700
ps. This time scale decreases to only 4
ps as the fluence is increased to 11
J
cm
−2. It then jumps to 500
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 1000
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. |
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ISSN: | 0169-4332 1873-5584 |
DOI: | 10.1016/j.apsusc.2009.10.004 |