Generation of shock waves by laser-induced plasma in confined geometry

Devaux, David; Fabbro, R.; Tollier, L.; Bartnicki, Eric

doi:10.1063/1.354710

Cited by 237 publications

(115 citation statements)

References 15 publications

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“…For the same laser fluence, the use of the femtosecond laser pulse results in a higher power density (~ 10 15 W/cm 2 ), which is appoximately five orders of magnitude higher than the nanosecond laser (~10 9 -10 10 W/cm 2 ). It is known that higher laser power density increases the mechanical load placed on materials due to high ablation and plasma pressures [26,27]. In the present study of the single crystal superalloy, a layer of plastically deformed material ~5 m in extent was observed.…”

Section: Discussionmentioning

confidence: 51%

Femtosecond Laser Micromachining of Single-Crystal Superalloys

Feng

Picard

Liu

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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Investigations on femtosecond laser micromachining of single crystal superalloys with and without plasma-sprayed thermal barrier coatings were conducted under laser fluences ranging from 0.1 J/cm 2 up to 160 J/cm 2 . Micromachining was carried out in air using a titanium:sapphire laser system ( = 780 nm) operating at a repetition rate of 1 kHz and delivering individual pulses of ~150 fs duration. The ablation threshold of the single crystal superalloy was determined as 203 ± 20 mJ/cm 2 . Laser-induced damage was examined by means of scanning electron microscopy and transmission electron microscopy. These studies indicate a complete absence of any melting, recast layers, heat-affected zones or microcracks in the vicinity of the machining area. The only form of damage observed in the single crystal superalloy machined near or above the ablation threshold was a laser-induced plastically deformed layer with a maximum extent of ~5 m. Machining through ceramic thermal barrier coatings on a superalloy produced no delamination along the superalloy/coating interfaces or cracks within the TBC or bond coat. The residual roughness of the machined surface was in the sub-micron range. The present study suggests that femtosecond laser micromachining is a very promising technique for production of finescale features in multi-layer material systems for aerospace and power generation components.

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Section: Discussionmentioning

confidence: 51%

Femtosecond Laser Micromachining of Single-Crystal Superalloys

Feng

Picard

Liu

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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“…The particle velocity history was measured using an optically recording velocity interferometer system (ORVIS). A continuouswave Nd:YVO 4 laser with a wavelength of 532 nm was used as the probe light for interferometry. The probe light was focused through the transparent PETN [110] sample onto the rear side of the aluminum surface.…”

Section: Methodsmentioning

confidence: 99%

“…A glass target assembly was used [4]. Figure 1 schematically depicts the target assembly used in this experiment.…”

Section: Target Assemblymentioning

confidence: 99%

Particle velocity history of pentaerythritol tetranitrate shocked along [110] crystal orientation by laser-accelerated miniature flyer impactc

Wakabayashi¹,

Matsumura²,

Nakayama³

et al. 2012

AIP Conference Proceedings

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Abstract. We performed miniature flyer impact experiments to investigate the thermodynamic and optical properties of shocked single-crystal pentaerythritol tetranitrate (PETN). A thin metal plate was accelerated by irradiating it with pulse from a tabletop laser, and impacted on a single crystal of PETN along the [110] axis. The particle velocity history of the laser-accelerated flyer was measured using an optically recording velocity interferometer system. The relationship between the actual particle velocity and the particle velocity measured by the velocity interferometer was obtained by analyzing the particle velocities immediately before and after the flyer collided with the PETN [110] single crystal. The change in the refractive index of the shocked PETN [110] immediately after a shock wave had propagated was also studied.

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“…The target assembly with a plasma confinement geometry [7,8] was fabricated with a back-up float glass substrate (100 × 100 × 3 mm 3 ), 30-µm thick aluminum foil, a 50-µm thick Teflon spacer, and a cover float glass substrate (100 × 100 × 3 mm 3 ). The sample was filled into the space surrounded by the Teflon and glasses (Fig.…”

Section: Methodsmentioning

confidence: 99%

Laser-Shock Compression of Rhodamine 6G Dye in Ethanol Solution Studied by Time-Resolved Fluorescence Spectroscopy

Ichiyanagi

Igarashi

Matsuda

et al. 2004

J. Plasma Fusion Res.

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A laser shock wave is generated by the irradiation of a 10-ns pulsed laser beam using a plasma confinement target assembly. Nanosecond time-resolved fluorescence spectroscopy is performed on rhodamine-6G dye in an ethanol solution. The fluorescence spectra show a red shift under shock compression. The observed data demonstrate that the fluorescence of rhodamine-6G dye is suitable for use as a pressure scale for laser shock compression at the examined pressure range.

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Generation of shock waves by laser-induced plasma in confined geometry

Cited by 237 publications

References 15 publications

Femtosecond Laser Micromachining of Single-Crystal Superalloys

Femtosecond Laser Micromachining of Single-Crystal Superalloys

Particle velocity history of pentaerythritol tetranitrate shocked along [110] crystal orientation by laser-accelerated miniature flyer impactc

Laser-Shock Compression of Rhodamine 6G Dye in Ethanol Solution Studied by Time-Resolved Fluorescence Spectroscopy

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