Phase-change phenomena and acoustic transient generation in the pulsed laser induced ablation of absorbing liquids

Kim, Dongsik; Grigoropoulos, Costas P.

doi:10.1016/s0169-4332(97)00609-0

Cited by 40 publications

(44 citation statements)

References 6 publications

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“…This observation agrees with experimental observations that a significantly higher pressure builds up in the absorption region 157 and a much stronger acoustic signal is produced 36,37 when the conditions for stress confinement are satisfied. Several contributions to the compressive pressure can be identified in the simulations.…”

Section: Laser-induced Pressure Wavessupporting

confidence: 91%

“…Since the transition from desorption to ablation is not reflected in the number of ejected monomers, it can easily remain unnoticed in a post-ionization experiment. An interpretation of the physical mechanisms of material ejection should not be based solely on the mass spectrometry data, 15,21 but should be complemented by measurements of other characteristics, such as shapes of the acoustic waves propagating from the absorption region [31][32][33][34][35][36][37][38][39]115 or cluster detection in fast imaging 109,116,162,163 and trapping plate 28 experiments.…”

Section: Laser Fluencementioning

confidence: 99%

“…Experimental piezoelectric measurements of laser induced acoustic signal indicate that the shape and the amplitude of the signal have strong dependence on the irradiation conditions. [31][32][33][34][35][36][37][38][39]115,116 The direct links between the results of photoacoustic measurements and complex processes in the absorption region, however, still have to be established. MD simulations provide an opportunity to perform a detailed analysis of the relations between the character of the molecular ejection in the regimes of thermal and stress confinement and the parameters of the pressure waves.…”

Section: Laser-induced Pressure Wavesmentioning

confidence: 99%

See 2 more Smart Citations

Computer Simulations of Laser Ablation of Molecular Substrates

Zhigilei

Leveugle

Garrison³

et al. 2003

Chem. Rev.

279

248

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Section: Laser-induced Pressure Wavessupporting

confidence: 91%

Section: Laser Fluencementioning

confidence: 99%

Section: Laser-induced Pressure Wavesmentioning

confidence: 99%

See 1 more Smart Citation

Computer Simulations of Laser Ablation of Molecular Substrates

Zhigilei

Leveugle

Garrison³

et al. 2003

Chem. Rev.

279

248

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“…The momentum transfer results in a force-time curve similar to curves of pressure vs. time presented by Kim and Grigoropoulos [3]. In light of the new evidence, we propose the following mechanism for cavity formation and force generation:…”

Section: Iccd Imagingsupporting

confidence: 75%

“…The interaction of a laser with liquid is a somewhat complex process described at some length by Kim and Grigoropoulos [3]. As the laser pulse imparts energy to the liquid, if the pulse length is short compared to the characteristic time for thermal diffusion to take place, the process will be acoustically dominated.…”

Section: Introductionmentioning

confidence: 99%

Ablation of Liquids for Laser Propulsion with TEA CO2 Laser

Sinko¹,

Kodgis²,

Porter³

et al. 2006

AIP Conference Proceedings

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air Force Research Laboratory (AFMC) AFRL/PRS SPONSOR/MONITOR'S Pollux Drive NUMBER(S)Edwards AFB CA 93524-70448 AFRL-PR-ED-TP-2005-396 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited SUPPLEMENTARY NOTESPresented at the 4 th International Symposium on Beamed Energy Propulsion, Nara, Japan, 11-14 Nov 2005. ABSTRACTTime-resolved force sensing and intensified charge-coupled device (ICCD) imaging techniques were applied to the study of the force generation mechanism for laser ablation of liquids. A Transversely Excited at Atmospheric pressure (TEA) CO 2 laser operated at 10.6 μm, 300 ns pulse width, and 9 J pulse energy was used to ablate liquids contained in various aluminum and glass vessels. Net imparted impulse and coupling coefficient were derived from the force sensor data and relevant results will be presented for various container designs and liquids used. ICCD imaging was used in conjunction with the dynamic force techniques to examine dependencies on absorption depth, irradiance, surface curvature, and container geometry. ICCD imaging was also used to determine whether surface or volume absorption should be preferable for laser propulsion using liquid propellants. Finally, ballistic experiments were conducted in order to verify the dynamic force data and lend additional evidence as to the predominant methods of force generation. Abstract. Time-resolved force sensing and intensified charge-coupled device (ICCD) imaging techniques were applied to the study of the force generation mechanism for laser ablation of liquids. A Transversely Excited at Atmospheric pressure (TEA) CO 2 laser operated at 10.6 μm, 300 ns pulse width, and 9 J pulse energy was used to ablate liquids contained in various aluminum and glass vessels. Net imparted impulse and coupling coefficient were derived from the force sensor data and relevant results will be presented for various container designs and liquids used. ICCD imaging was used in conjunction with the dynamic force techniques to...

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LIBS Analysis of Liquids and of Materials Inside Liquids

Lazic

2014

Springer Series in Optical Sciences

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Abbreviations and Symbols CILaser induced plasma formation on or inside liquids is characterized by large energy losses due to liquid evaporation. Ablation of a liquid surface is followed by hydro-dynamical instabilities and splashing. Plasma generation inside bulk liquids is affected by the light absorption and scattering, and it is accompanied by intense pressure waves and successive vapor cavitation. Efficient LIBS analyses in presence of liquids require different considerations; the examples are reported and discussed in following. IntroductionLaser induced plasma formation has the irradiance threshold dependent on the sample density, and generally it progressively reduces when passing from gases, to liquids and then to solids. Excluding the losses along the beam path, this means that less laser energy is required for ablation of dry or submerged solid materials than for ablation of a liquid or for generating breakdown inside liquids. Plasma formation in presence of liquids is not efficient because a great portion of the laser energy is expended for the liquid vaporization; this strongly reduces the energy available for the plasma excitation. It has been estimated that about 75 % of the input radiation is consumed for vaporization during laser induced breakdown (LIB) inside water [1]. Furthermore, both water and organic solutions contain hydrogen, which contributes to a rapid thermalization and cooling of the formed plasma. Once the plasma is created in liquids, the high density and nearly incompressible medium strongly confines the plume; the corresponding effects on the plasma evolution and LIBS signal are recently reviewed [2]. Laser ablation (LA) of liquids by short, intense pulses is a complex process where the liquid surface is no longer in equilibrium with the surrounding vapor; this results in a very high net mass flux from the sample surface to the surrounding [3 and references therein]. The high mass flux increases the pressure at the target surface and so raises the boiling temperature. Once the normal boiling is established, the presence of volumetric energy densities slightly higher than that equivalent to the saturation temperature causes the formation and growth of a vapor bubble. If the deposition rate of volumetric energy density by a laser pulse exceeds the energy consumed by vaporization, the liquid is driven to a metastable state until the spinoidal temperature is reached. At this temperature, the liquid undergoes so called ''spinoidal decomposition'' where the entire superheated liquid volume separates into saturated liquid and vapor, which are ejected into atmosphere. This process occurs normally during LIBS sampling of a liquid surface. In case of water ablation it has been estimated that less than 50 % of the deposited energy transforms into vapor while the remaining part is consumed for ejection of droplets [3]. The energy loss on droplet expulsion i.e. splashing further degrades the LIBS signal.LIBS measurements are often performed on water solutions or inside the same. Laser intera...

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Phase-change phenomena and acoustic transient generation in the pulsed laser induced ablation of absorbing liquids

Cited by 40 publications

References 6 publications

Computer Simulations of Laser Ablation of Molecular Substrates

Computer Simulations of Laser Ablation of Molecular Substrates

Ablation of Liquids for Laser Propulsion with TEA CO2 Laser

LIBS Analysis of Liquids and of Materials Inside Liquids

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