Generation and detection of picosecond acoustic pulses in thin metal films

Eesley, G. L.; Clemens, Bruce M.; Paddock, Carolyn A.

doi:10.1063/1.98077

Cited by 116 publications

(52 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ultrasound amplitudes were characterized by the surface displacements of the foil's rear side, measured by means of a high-frequency interferometry technique. [18][19][20] This technique presents the considerable advantage over the more usual and higher-frequency pump-probe piezoreflectance detection technique [21][22][23][24][25][26] that the time dependence of the rear surface displacement can be measured with a single laser shot. Oppositely, the pump-probe piezoreflectance technique requires as many laser shots as there are measured times.…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Среди них обнаружение эффектов "надпороговой" ионизации атомов и генерации высоких (с номерами [20][21][22][23][24][25][26][27][28][29][30] оптических гармоник в газах в сверхсильных световых полях [6,7], "холодное" плавление полупроводниковых монокристаллов [8,9], ге нерация плотной фемтосекундной лазерной плазмы с электронной темпера турой, достигающей Т е 1 кэВ [10 -12].…”

Section: введение мощные пико и фемтосекундные лазерные импульсы в оunclassified

“…В эксперименте [28] для возбуждения и регистрации сверхкоротких аку стических импульсов в пленках металлов Ni, Zr, Ti и Pt использовалась оп тическая схема, представленная на рис. 12.…”

Section: физика лазерного возбуждения сверхкоротких акустических импуunclassified

“…Подводя итог обзору экспериментальных работ, укажем, что минималь ные длительности импульсов деформации, зарегистрированные к настоящему времени, составляют 5 -15 пс [28,33].…”

Section: физика лазерного возбуждения сверхкоротких акустических импуunclassified

“…В этом экс перименте как раз реализован ре Сравнение рис. 28,а и б наглядно демонстирует дифракционное уменьшение ха рактерной длительности ОА им пульсов давления при переходе из ближней в дальнюю волновую зо ну.…”

Section: 1unclassified

See 2 more Smart Citations

Laser excitation of ultrashort acoustic pulses: New possibilities in solid-state spectroscopy, diagnostics of fast processes, and nonlinear acoustics

Akhmanov¹,

Gusev²

1992

Usp. Fiz. Nauk

View full text Add to dashboard Cite

Impulsive Stimulated Thermal Scattering

Rogers¹,

Maznev

Nelson

2002

Characterization of Materials

View full text Add to dashboard Cite

Impulsive stimulated thermal scattering (ISTS) is a purely optical, non‐contacting method for characterizing the acoustic behavior of surfaces, thin membranes, coatings, and multilayer assemblies, as well as bulk materials . The method has emerged as a useful tool for materials research in part because: (1) it enables accurate, fast, and nondestructive measurement of important acoustic (direct) and elastic (derived) properties that can be difficult or impossible to evaluate in thin films using other techniques; (2) it can be applied to a wide range of materials that occur in microelectronics, biotechnology, optics, and other areas of technology; and (3) it does not require specialized test structures or impedance‐matching fluids which are commonly needed for conventional mechanical and acoustic tests. Further, recent advances in experimental design have simplified the ISTS measurement dramatically, resulting in straightforward, low‐cost setups, and even in the development of a commercial ISTS photoacoustic instrument that requires no user adjustments of lasers or optics. With this tool, automated single‐point measurements, as well as scanning‐mode acquisition of images of acoustic and other physical properties, are routine. ISTS, which is based on transient grating (TG) methods, is a spectroscopic technique that measures the acoustic properties of thin films over a range of acoustic wavelengths. This article, focuses only on ISTS measurement of acoustic motions in thin films. It begins with an overview of other related measurement techniques. It then describes the ISTS acoustic data and demonstrates how it can be used to determine: (1) the stress and flexural rigidity in thin membranes; (2) the elastic constants of membranes and supported films; and (3) the thicknesses of single or multiple films in multilayer stacks.

show abstract

Generation and detection of picosecond acoustic pulses in thin metal films

Cited by 116 publications

References 9 publications

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

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

Laser excitation of ultrashort acoustic pulses: New possibilities in solid-state spectroscopy, diagnostics of fast processes, and nonlinear acoustics

Impulsive Stimulated Thermal Scattering

Contact Info

Product

Resources

About