| Téléchargement | - Voir le manuscrit accepté : Ultrasound Generated by a Femtoscond and a Picosecond Laser Pulse Near the Ablation Threshold (PDF, 579 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1063/1.1999827 |
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| Auteur | Rechercher : Hebert, H.; Rechercher : Vidal, F.; Rechercher : Martin, F.; Rechercher : Kieffer, J.-C.; Rechercher : Nadeau, A.; Rechercher : Johnston, T. W.; Rechercher : Blouin, A.1; Rechercher : Moreau, A.1; Rechercher : Monchalin, J. -P.1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut des matériaux industriels du CNRC
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| Format | Texte, Article |
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| Résumé | 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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| Date de publication | 2005-08-01 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRCC 48897 |
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| Numéro NPARC | 15979188 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 3987b953-5be4-4683-bc01-cb17afdb4a44 |
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| Enregistrement créé | 2010-12-10 |
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| Enregistrement modifié | 2020-04-07 |
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