Ultrafast interferometric microscopy for laser-driven shock wave characterization

Gahagan, K. T.; Moore, David S.; Funk, David J.; Reho, James; Rabie, R. L.

doi:10.1063/1.1505976

Cited by 49 publications

(23 citation statements)

References 9 publications

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“…Taking into consideration the low-pass filter broadening, our measured rise time is within reasonable agreement with prior measurements of 4-6 ps in thin aluminum films using femtosecond laser driven shocks. [9][10][11] The elastic and plastic waves, shown in Figs. 5 and 6, exhibit a similar behavior on this sub-10 m scale to stresses in aluminum on the order of hundreds of microns to centimeters.…”

Section: Resultsmentioning

confidence: 99%

“…Prior work using compressed ϳ150 fs duration laser pulses have generated shocks in films of 0.250-1.0 m thickness and observed only a single wave. [8][9][10][11] Molecular dynamic models on metals, however, suggest that the transition from elastic to plastic deformation response may occur on micron length scales and picosecond time scales. [12][13][14] Using a shaped chirped-pulse amplified ultrafast laser to generate supported shocks ͑to be discussed later͒, we have successfully generated and measured both elastic and plastic waves in aluminum films ranging from 2 -8 m thick.…”

Section: Introductionmentioning

confidence: 99%

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The elastic-plastic response of aluminum films to ultrafast laser-generated shocks

Whitley

McGrane

Eakins

et al. 2011

Journal of Applied Physics

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140

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We present the free surface response of 2, 5, and 8 m aluminum films to shocks generated from chirped ultrafast lasers. We find two distinct steps to the measured free surface velocity that indicate a separation of the faster elastic wave from the slower plastic wave. We resolve the separation of the two waves to times as short as 20 ps. We measured peak elastic free surface velocities as high as 1.4 km/s corresponding to elastic stresses of 12 GPa. The elastic waves rapidly decay with increasing sample thickness. The magnitude of both the elastic wave and the plastic wave and the temporal separation between them was strongly dependent on the incident laser drive energy.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The elastic-plastic response of aluminum films to ultrafast laser-generated shocks

Whitley

McGrane

Eakins

et al. 2011

Journal of Applied Physics

Self Cite

140

View full text Add to dashboard Cite

show abstract

“…The evaluation of the fringe shifts (from surface interference and Mach Zehnder shadowgraphy) was done, according to a procedure described in detail elsewhere [ 27,28]. Briefly, two images were taken, one before and one during/after the laser pulse (i.e.…”

Section: Article In Pressmentioning

confidence: 99%

Time-resolved techniques as probes for the laser ablation process

Hauer

Funk

Lippert

et al. 2005

Optics and Lasers in Engineering

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Laser material processing is an increasing market although many processes are still not yet fully understood. It was repeatedly emphasized that a better understanding of the transient processes can help to improve the understanding of the ablation mechanism. Examples using ns-surface interferometry, ns-shadowgraphy and emission spectroscopy are shown to illustrate how these techniques can be used to obtain new insights in the laser ablation processes.Time-resolved surface interferometry probes the remaining polymer, while ns-shadowgraphy and plasma spectroscopy observe the ablation products. Ns-shadowgraphy can be used for fluences just above the ablation threshold, to the fluences where a plasma is observed, which is probed by emission spectroscopy.Time-resolved ns-surface interferometry of a specially designed triazene polymer reveals that the surface morphology changes and thereby the surface removal occurs only during the laser pulse. Ns-shadowgraphy is used to observe the shockwave and the plume of fragments, which are generated during laser ablation. A comparison of the ablation properties of an energetic polymer at two different wavelengths (1064 and 193 nm) shows that the ejection of non-gaseous fragments (solid or liquid) is only detected after irradiation with 1064 nm. At higher laser fluences, plasma is formed, and the atomic (H), and diatomic species (CN, CH and C 2 ) are identified. r

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“…100 fs time resolution, provides an extraordinary amount of information, and is discussed in detail by Gahagan, et al, in this proceedings volume [6].…”

Section: Methodsmentioning

confidence: 99%

Sub-picosecond Laser-Driven Shocks in Metals and Energetic Materials

Moore¹,

Funk²,

Gahagan

et al. 2002

AIP Conference Proceedings

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Abstract.A high-energy sub-picosecond laser was used both to drive a shock into thin film targets and to spectroscopically interrogate the shocked material. Targets were thin films of molecular materials coated or grown upon thin vapor-plated metal films on thin glass substrates, or neat metal films on thin glass substrates. The non-linear optical interaction of the shock-driving laser with the thin glass substrate produced surprisingly flat shock waves. Sub-picosecond time-resolved frequency-and spatial-domain interferometries were used to characterize the shock wave as it transited from the thin metal film into the thin molecular material layer. Overviews of the effect of the pressure-dependent complex index of refraction of the shocked thin film metal layer, ultrafast interferometric interrogation of shocked molecular materials (examples: glycidyl azide polymer and nitrocellulose thin films), and progress in preparation of, as well as the need for, uniform, well oriented, thin energetic material layers appropriate to such highly time-resolved methods are presented.

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Ultrafast interferometric microscopy for laser-driven shock wave characterization

Cited by 49 publications

References 9 publications

The elastic-plastic response of aluminum films to ultrafast laser-generated shocks

The elastic-plastic response of aluminum films to ultrafast laser-generated shocks

Time-resolved techniques as probes for the laser ablation process

Sub-picosecond Laser-Driven Shocks in Metals and Energetic Materials

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