Reduction of the hot electron energies with increasing pulse rise time in CO2-laser–target interaction
1987; AIP Publishing; Volume: 30; Issue: 9 Linguagem: Inglês
10.1063/1.866055
ISSN2163-4998
AutoresR. Décoste, C. Y. Côté, P. Lavigne, P. Alaterre, J. P. Matte,
Tópico(s)Laser Design and Applications
ResumoThe effect of increasing the laser pulse rise time on the hot electron energy distribution is studied using one or three prepulses near or on the rise of a main CO2-laser pulse. For some slower rising pulses, the pressure from a hot and long gradient plasma balances the ponderomotive laser force in such a way that the hot electron energies are significantly reduced while the overall resonance absorption fraction remains almost the same. The experimental results are modeled with a 1-D hydrocode using multigroup fast electrons and a dependence of the absorption and the hot electron temperature on the density gradient scale length at the critical density. Qualitative agreement is obtained over a wide range of laser pulse conditions and rise times.
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