Heating of Solids With Ultra-Short Laser Pulses

More, R.M.; Zinamon, Z.; Warren, K.H.; Falcone, R. W.; Murnane, Margaret M.

doi:10.1051/jphyscol:1988705

Cited by 8 publications

(11 citation statements)

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“…2 Thus, using table-top ultrashort pulse lasers, it is now possible to study laser-matter interaction under extreme conditions in relation to the fast ignition scheme for inertial confinement fusion ͑ICF͒, 3 harmonic generation, 4,5 ultrashort x-ray generation 6 and laser-cluster Coulumb explosions, 7 …”

Section: Introductionmentioning

confidence: 99%

Hot electron generation via vacuum heating process in femtosecond laser–solid interactions

et al. 2001

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Hot electron generation by the vacuum heating process has been studied in the interaction of 150 fs, 5 mJ, 800 nm P-polarized laser pulses with solid targets. The measurements have suggested that the “vacuum heating” is the main heating process for the hot electrons with high energies. The energy of the vacuum-heated hot electrons has been found to be higher than the prediction from the scaling law of resonance absorption. Particle-in-cell simulations have confirmed that the hot electrons are mainly generated by the vacuum heating process under certain experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Hot electron generation via vacuum heating process in femtosecond laser–solid interactions

et al. 2001

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“…From the exact refractive index of Eq. (5) we find then the ratio r/£ = 0.03018 (11) and the selection of the modes (indeed to be generalised to any emission direction from any point within the medium) may then be given by the ratio of the cone determined by r/£ to the full unity sphere, L = 4 g (r/£) 2 (12) Summarising this for the laser of 10 Angstrom wave length, if ten times ionization is produced and atoms of 100 times the mass of the light hydrogen isotape is used, we find n* > 3 ' 4 * 1Q2° (13) 23 -3 Taking into account that n* is around the value 10 cm , the conditions are well fitting realistic lengths £ above 100 micrometer.…”

Section: Geometrical Factormentioning

confidence: 97%

“…It is just the advantage of the physics of the fsec laser pulse interaction with solids (e.g. with foils) that the physics of homogeneous high temperature plasmas at solid state density can be studied [11] if not such high laser intensities are incident that relativistic oscillations of the electrons occur in which case a collisionless absorption will cause an explosion of the target by the ponderomotion due to nonlinear forces [12].…”

Section: Energy Transfer To the Plasmamentioning

confidence: 99%

Threshold Estimations For Schafer's Photo-Ionization-Line Decay X-Ray Laser

Hora

1986

SPIE Proceedings

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Schafer's PHILDEX -laser is a new scheme which consists in a cylinder -optical concentration of a short excimer laser pulse irradiating the high -Z coating of a cylindrical solid core of length R. and radius r. The pulse moves like a boots trap along the coating with nearly the speed of light. After 50% of the laser radiation is converted to X-radiation in the coating, this photo-ionizes preferentially the electrons in the lowest level of the core material. If nearly complete depletion with an atomic density n *(inverted states) is reached, the electrons at the energetically next higher level will decay to the lower level. For R» r, the preferential direction of the emitted superradiance along the axis will produce an X -ray laser pulse. For this laser some estimations are reported about the following properties: the line shift by recoil in the core which was assumed to be an instantly produced plasma where no Mössbauer-recoil is permitted. This is combined with the Doppler shift of the ionic motions. The overlapping of lines is found sufficient for the laser.An estimation of the necessary inversion density and the geometry of the medium are given. For the then necessary minimum core length of lmm, laser pulses in the order of 100 J are necessary with duration of less than 3 psec, preferably less.

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“…The calculation is carried out by means of the average atom approximation, making use of the well-known INFERNO model (Liberman, 1979). The ionic component of the specific heat was obtained using the QEOS model (More et al, 1988a;1988b), specifically its description of a hot fluid. As the temperature approaches that of the gas phase the specific heat approaches the value of 3/2 k.…”

Section: Energy Content Of the Titanium Foilmentioning

confidence: 99%

Energy content of target and electron flow in femtosecond laser target interactions

2015

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The heating of the titanium foil in a recent femtosecond laser plasma experiment is investigated theoretically in two different ways. In the first, the energy content and thus the heating efficiency of the central volume of the foil is derived by integrating the transverse temperature profiles obtained in this experiment, using specific heats based on the average atom model. In the second approach target heating by the fast electrons, both by direct energy deposition and by resistive heating is investigated. The latter approach makes use of a specially devised electron flow model which includes a simplified quantitative treatment of multi-refluxing as a crucial component. In all, the calculated results of electron beam heating are consistent with experiment within the limitations of the modeling. Finally, a prediction for the temporal dependence of the Kα pulse from the central volume of the foil based on our electron flow model is given.

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Heating of Solids With Ultra-Short Laser Pulses

Cited by 8 publications

References 0 publications

Hot electron generation via vacuum heating process in femtosecond laser–solid interactions

Hot electron generation via vacuum heating process in femtosecond laser–solid interactions

Threshold Estimations For Schafer's Photo-Ionization-Line Decay X-Ray Laser

Energy content of target and electron flow in femtosecond laser target interactions

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