Optical discharges

Raĭzer, Yurii P

doi:10.1070/pu1980v023n11abeh005064

Cited by 73 publications

(25 citation statements)

References 18 publications

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“…31 At the mean laser power density of 7.3ϫ10 7 W/cm 2 , a plasma pressure of 1.9ϫ10 7 Pa is reached. The time evolution of the plasma pressure was estimated by the two-dimensional expansion of the LSD model given by Reilly et al 32 According to this model, the expansion of the plasma at the border of the irradiated area leads to regions of reduced pressure moving inward towards the center.…”

Section: B Surface Pressurementioning

confidence: 99%

Material transport during excimer-laser nitriding of iron

Illgner

Schaaf

Lieb

et al. 1998

Journal of Applied Physics

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The surface topology and nitrogen concentration profiles of iron irradiated with pulses of an excimer laser in a nitrogen atmosphere were studied by means of optical and scanning electron microscopy, surface profilometry, energy-dispersive x-ray spectroscopy, and resonant nuclear reaction analysis. The observations are combined to distinguish several mechanisms contributing to the material transport: ablation, redeposition of nitride from the plasma and pressure-induced lateral flow of the molten iron towards the edges of the laser spot ͑piston mechanism͒. Numerical estimates of the time and spatial evolution of temperature and pressure at the surface led to average rates of the material transport in good agreement with the experiment.

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Section: B Surface Pressurementioning

confidence: 99%

Material transport during excimer-laser nitriding of iron

Illgner

Schaaf

Lieb

et al. 1998

Journal of Applied Physics

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“…Thus, the region behind the focus is "shielded" by the plasma absorption. 30,430,[439][440][441] A realistic explanation for the plasma expansion is provided by the "moving breakdown" model originally proposed by Raizer 442 and further refined by Docchio and co-workers. 439,440 As depicted in Figure 53, this model assumes that optical breakdown is independent of the preceding plasma formation and occurs at all locations where the irradiance exceeds the breakdown threshold.…”

Section: Plasma Formation Above the Breakdown Thresholdmentioning

confidence: 99%

Mechanisms of Pulsed Laser Ablation of Biological Tissues

Vogel

Venugopalan

2003

ChemInform

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“…13 Then, the gas suddenly becomes a strongly absorbing medium for the laser power which accelerates the free electrons up to energies able to excite and ionize atoms or molecules. This explains why the plasma can be produced with a very high accuracy in a well defined volume limited by strong temperature gradients ͑up to 10 5 K/mm͒ 14 without any material wall in its vicinity.…”

Section: A Principle Of the Continuous Optical Discharge (Cod)mentioning

confidence: 99%

Properties of an argon plasma free jet generated from a continuous optical discharge

Lebehot

Campargue

1996

Physics of Plasmas

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The expansion of a supersonic free jet generated from a laser-sustained argon plasma is studied experimentally by using two techniques: ͑i͒ the time-of-flight analysis of velocity distributions of the atom beam skimmed from the free jet, leading to the conclusion that the translational relaxation of the heavy particles ͑neutral atoms and ions͒ follows very accurately the classical isentropic laws; ͑ii͒ the fluorescence technique for studying the internal state relaxation process by local analysis of the radiation emitted spontaneously from the plasma free jet. Only the electronic states excited above 14.5 eV are found to be in a Boltzmann equilibrium, defining a local temperature T excit in the structure of the free jet. The axial electronic temperature, calculated using a simple one-dimension thermodynamic model, follows fairly well the experimental values of T excit , while the translational temperature of the heavy particles decreases much lower, in agreement with the asymptotic value deduced from the velocity distributions of the atom beam. Thus appears the uncoupling between the electronic excitation process, governed by the electronic collisions, and the translational cooling of the heavy particles, governed by the collisions between the heavy particles. A more detailed analysis of the excitation process is obtained through the calculation of the state population densities with a collisional-radiative model. The agreement with the experimental measurements is rather good for most of the states investigated.

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Optical discharges

Cited by 73 publications

References 18 publications

Material transport during excimer-laser nitriding of iron

Material transport during excimer-laser nitriding of iron

Mechanisms of Pulsed Laser Ablation of Biological Tissues

Properties of an argon plasma free jet generated from a continuous optical discharge

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