Revival of femtosecond laser plasma filaments in air by a nanosecond laser.
Opt Express
; 17(14): 11450-6, 2009 Jul 06.
Article
in En
| MEDLINE
| ID: mdl-19582060
ABSTRACT
Short lived plasma channels generated through filamentation of femtosecond laser pulses in air can be revived after several milliseconds by a delayed nanosecond pulse. Electrons initially ionized from oxygen molecules and subsequently captured by neutral oxygen molecules provide the long-lived reservoir of low affinity allowing this process. A Bessel-like nanosecond-duration laser beam can easily detach these weakly bound electrons and multiply them in an avalanche process. We have experimentally demonstrated such revivals over a channel length of 50 cm by focusing the nanosecond laser with an axicon.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Optics and Photonics
/
Lasers
Language:
En
Journal:
Opt Express
Journal subject:
OFTALMOLOGIA
Year:
2009
Document type:
Article
Affiliation country: