Accession Number : ADA318140

Title :   Plasma Channel Formation and Guiding During High Intensity Short Pulse Laser Plasma Experiments.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH

Personal Author(s) : Ting, A. ; Burris, H. R. ; Esarey, E. ; Sprangle, P. ; Moore, C. I.

PDF Url : ADA318140

Report Date : 25 OCT 1996

Pagination or Media Count : 14

Abstract : A plasma waveguide is formed during the interaction of a high power (2TW) subpicosecond pump laser pulse with a hydrogen (or helium) gas jet target. The channel is produced from displacement (or cavitation) of plasma electrons by the large ponderomotive force of the focused pump laser and the subsequent radial expulsion of plasma ions due to charge separation. Using Thomson scattering diagnostics and mode structure measurements, a trailing probe laser pulse is observed to be guided throughout the length of this channel for about 20 Rayleigh lengths - approximately equal to the propagation length of the self-guided pump laser pulse.

Descriptors :   *LASER PUMPING, *PLASMA WAVES, HIGH POWER, DISPLACEMENT, PULSED LASERS, OPTICAL WAVEGUIDES, SEPARATION, CHANNELS, CAVITATION.

Subject Categories : Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE