Plasma Channel Formation and Guiding During High Intensity Short Pulse Laser Plasma Experiments.
NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH
Pagination or Media Count:
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.
- Plasma Physics and Magnetohydrodynamics