dorsal/arxiv
View SchemaFormation of laser plasma channels in a stationary gas
| Authors | A. Dunaevsky, A. Goltsov, J. Greenberg, S. Suckewer, E. Valeo, N. J. Fisch |
|---|---|
| Categories | |
| ArXiv ID | physics/0508020 |
| URL | https://arxiv.org/abs/physics/0508020 |
| DOI | 10.1063/1.2195383 |
| Journal | Phys. Plasmas 13, 043106 (2006) |
Abstract
The formation of plasma channels with nonuniformity of about +- 3.5% has been demonstrated. The channels had a density of 1.2x10^19 cm-3 with a radius of 15 um and with length >= 2.5 mm. The channels were formed by 0.3 J, 100 ps laser pulses in a nonflowing gas, contained in a cylindrical chamber. The laser beam passed through the chamber along its axis via pinholes in the chamber walls. A plasma channel with an electron density on the order of 10^18 - 10^19 cm-3 was formed in pure He, N2, Ar, and Xe. A uniform channel forms at proper time delays and in optimal pressure ranges, which depend on the sort of gas. The influence of the interaction of the laser beam with the gas leaking out of the chamber through the pinholes was found insignificant. However, the formation of an ablative plasma on the walls of the pinholes by the wings of the radial profile of the laser beam plays an important role in the plasma channel formation and its uniformity. A low current glow discharge initiated in the chamber slightly improves the uniformity of the plasma channel, while a high current arc discharge leads to the formation of overdense plasma near the front pinhole and further refraction of the laser beam. The obtained results show the feasibility of creating uniform plasma channels in non-flowing gas targets.
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"abstract": "The formation of plasma channels with nonuniformity of about +- 3.5% has been\ndemonstrated. The channels had a density of 1.2x10^19 cm-3 with a radius of 15\num and with length \u003e= 2.5 mm. The channels were formed by 0.3 J, 100 ps laser\npulses in a nonflowing gas, contained in a cylindrical chamber. The laser beam\npassed through the chamber along its axis via pinholes in the chamber walls. A\nplasma channel with an electron density on the order of 10^18 - 10^19 cm-3 was\nformed in pure He, N2, Ar, and Xe. A uniform channel forms at proper time\ndelays and in optimal pressure ranges, which depend on the sort of gas. The\ninfluence of the interaction of the laser beam with the gas leaking out of the\nchamber through the pinholes was found insignificant. However, the formation of\nan ablative plasma on the walls of the pinholes by the wings of the radial\nprofile of the laser beam plays an important role in the plasma channel\nformation and its uniformity. A low current glow discharge initiated in the\nchamber slightly improves the uniformity of the plasma channel, while a high\ncurrent arc discharge leads to the formation of overdense plasma near the front\npinhole and further refraction of the laser beam. The obtained results show the\nfeasibility of creating uniform plasma channels in non-flowing gas targets.",
"arxiv_id": "physics/0508020",
"authors": [
"A. Dunaevsky",
"A. Goltsov",
"J. Greenberg",
"S. Suckewer",
"E. Valeo",
"N. J. Fisch"
],
"categories": [
"physics.plasm-ph",
"physics.optics"
],
"doi": "10.1063/1.2195383",
"journal_ref": "Phys. Plasmas 13, 043106 (2006)",
"title": "Formation of laser plasma channels in a stationary gas",
"url": "https://arxiv.org/abs/physics/0508020"
},
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