| Download | - View accepted manuscript: Ultrasound Generated by a Femtoscond and a Picosecond Laser Pulse Near the Ablation Threshold (PDF, 579 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1063/1.1999827 |
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| Author | Search for: Hebert, H.; Search for: Vidal, F.; Search for: Martin, F.; Search for: Kieffer, J.-C.; Search for: Nadeau, A.; Search for: Johnston, T. W.; Search for: Blouin, A.1; Search for: Moreau, A.1; Search for: Monchalin, J. -P.1 |
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| Affiliation | - National Research Council of Canada. NRC Industrial Materials Institute
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| Format | Text, Article |
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| Abstract | We have investigated high frequency ultrasound generated by single laser pulses in thin 50m aluminum foils as a function of the laser fluence. Laser-pulse durations of 80 fs and 270 ps were used to compare the ultrasound generated in two very different regimes: thermoelastic and ablation. The measured rear-surface displacement induced by the ultrasound pulse is similar after 50-m propagation through the foils for the two laser-pulse durations in the fluence range of 0.1–0.7 J /cm2. For fluences greater than the ablation threshold 0.25 and 0.63J/cm2 for the 80 -fs and 270-ps pulses,respectively, the ultrasound amplitude generated by the 270-ps laser pulse is increased significantly due to absorption of laser energy by the ablating plasma. This is not observed for the 80-fs laser pulse since ablation is produced well after the laser-pulse irradiation of the target. The measured surface displacement as a function of laser fluence is compared to the calculations of a one-dimensional fluid code for both laser-pulse durations. The model calculations agree in many ways with the experimental results, but some discrepancies are observed. |
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| Publication date | 2005-08-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 48897 |
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| NPARC number | 15979188 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 3987b953-5be4-4683-bc01-cb17afdb4a44 |
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| Record created | 2010-12-10 |
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| Record modified | 2020-04-07 |
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