Ultrasonic investigation of pulsed laser interaction with solid targets

Apostol, I.; Stoian, Razvan; Dabu, R.; Stratan, Aurel; Serbanescu-Oasa, Anca; Angelescu, Carmen G.

doi:10.1117/12.378717

Cited by 1 publication

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“…5 In the ablation regime, however, experimental and modeling efforts have been more recent. [6][7][8][9][10][11][12][13][14][15] Although it is well known that the ablation mechanisms depend strongly on the laser-pulse duration ͑see, for example, Refs. 16 and 17͒, the investigations on ultrasound generation in the ablative regime essentially deal with long laser pulses ͑typically in the nanosecond range͒.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound generated by a femtosecond and a picosecond laser pulse near the ablation threshold

Hébert

Vidal

Martín

et al. 2005

Journal of Applied Physics

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We have investigated high-frequency ultrasound generated by single laser pulses in thin (50μm) aluminum foils as a function of the laser fluence. Laser-pulse durations of 80fs and 270ps 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-μm propagation through the foils for the two laser-pulse durations in the fluence range of 0.1–0.7J∕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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