Method and system for increasing the lifespan of a plasma
AssigneesEcole Polytechnique, Centre National De La Recherche Scientifique, Ecole Nationale Superieure Des Techniques Avancees
InventorsAndre Mysyrowicz, Michel Franco
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Abstract
A method and a system for increasing the lifespan of a plasma obtained in the atmosphere. The method includes the following steps: emitting a femtosecond laser pulse, referred to as a first pulse, generating a column of plasma by the filamentation phenomenon, and emitting a second YAG laser pulse, focused by way of an axicon on a line in the plasma column, the energy of the photons of the second laser pulse being greater than the attachment energy of the electrons in the plasma to neutral molecules such as oxygen molecules. The duration of the second pulse is greater than the duration of the first pulse, and the delay between the two pulses is greater than one microsecond.
Claims15
Method for increasing the lifespan of a plasma, said method comprising the following steps:
- emission of a femtosecond laser pulse called the first pulse, generating a plasma column by the filamentation phenomenon, and
- emission of a second laser pulse that is focused on a line in the plasma column, the energy of the photons of this second laser pulse being greater than the attachment energy of the electrons of the plasma to neutral molecules such as oxygen molecules.
Device for increasing the lifespan of a plasma obtained in the atmosphere or in other gases, said device comprising:
- a first pulsed laser producing a femtosecond laser pulse called the first pulse, which generates a plasma column by the filamentation phenomenon, and
- a second laser producing a second laser pulse that is focused on a line in the plasma column, the energy of the photons of this second laser pulse being greater than the attachment energy of the electrons of the plasma to neutral molecules such as oxygen molecules.
Dependencies are inferred from the claim text.