Plasma Expansion Under Heating by a Co2 Laser Pulse

Tomlinson, R.G.

doi:10.1063/1.1653604

Cited by 19 publications

(4 citation statements)

References 7 publications

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“…More detailed comparison between the computed 2 3P population and experimental data [49] obtained from time-resolved laser-based absorption measurements have shown a satisfactory agreement. 5. Conclusion.…”

Section: Axial Results -In the Model Calculationsmentioning

confidence: 95%

“…These lasers have renewed [5][6][7][8] the interest in gas-breakdown phenomena because they offer a relatively simple way of generating megawatt power light pulses at high repetition rates with good shot-toshot reproducibility. The rapid rate of data acquisition allows precise studies on the hydrodynamic mode of propagation of the spark along the beam through detailed space-and-time resolved measurements of plasma parameters.…”

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confidence: 99%

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Laser-induced gas-breakdown model

Gauthier¹,

Geindre²

1979

Rev. Phys. Appl. (Paris)

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2014 Nous présentons un modèle unidimensionnel destiné à l'interprétation détaillée du spectre continu et discret émis par un plasma d'hélium créé par un laser à CO2. Ce modèle tient compte simultanément de la dynamique d'ionisation, du transfert de rayonnement, et de l'hydrodynamique (traitée par une simulation lagrangienne) du plasma. L'état d'ionisation du plasma est évalué par des modèles collisionnels radiatifs mettant en jeu de nombreux états excités pour chaque type d'ions. Le spectre émis par le plasma de claquage est calculé en fonction de la position et du temps au moyen d'un algorithme de transfert qui tient compte de la réabsorption et de l'élargissement Stark. Les résultats de la simulation qui concernent l'expansion du plasma, l'intensité absolue de l'émission lumineuse et le spectre continu et discret sont en accord favorable avec les résultats expérimentaux obtenus au laboratoire. Abstract. 2014 A one-dimensional model oriented toward a thorough understanding of line and continuum emission from a CO2 laser-induced helium plasma is presented. The model combines a time-dependent calculation of the ionization and radiation dynamics with a lagrangian hydrodynamic simulation code. Detailed collisional radiative models involving many neutral and ion excited levels are used to predict the plasma ionization state. A radiation transport algorithm including self-trapping effects and Stark broadening is developed which directly gives the space-and time-resolved spectrum of the breakdown plasma. Calculated plasma expansion, time-and spaceresolved absolute light intensities and line and continuum spectral shapes compare quite favorably with experimental data.

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Section: Axial Results -In the Model Calculationsmentioning

confidence: 95%

mentioning

confidence: 99%

Laser-induced gas-breakdown model

Gauthier¹,

Geindre²

1979

Rev. Phys. Appl. (Paris)

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“…2c) is formed at the focus corresponding to the dumping of the energy stored in the cavity field. Unlike other CO,, laser sparks [2,3], this one does not migrate from the focus and shows a particularly fast expansion rate of 5 to 6 • l0 G cm/s -1. After a delay of ~ 1 /xs a long unstable tail of successive and tess intense breakdowns occur ( fig.…”

Section: R E S U L T S a N D Discussionmentioning

confidence: 95%

“…6 Fm. Such lasers have been used to produce radiation induced breakdown with relative ease [2,3]. It appears from recently achieved pulse energies in excess of 100 J [4], that the CO2 laser may become an inexpensive competitor with the glass laser in the field of plasma heating.…”

Section: Introductionmentioning

confidence: 99%