Pattern dynamics and filamentation of femtosecond terawatt laser pulses in air including the higher-order Kerr effects.
Phys Rev E Stat Nonlin Soft Matter Phys
; 87(5): 053103, 2013 May.
Article
in En
| MEDLINE
| ID: mdl-23767639
ABSTRACT
Plasma defocusing and higher-order Kerr effects on multiple filamentation and pattern formation of ultrashort laser pulse propagation in air are investigated. Linear analyses and numerical results show that these two saturable nonlinear effects can destroy the coherent evolution of the laser field, and small-scale spatial turbulent structures rapidly appear. For the two-dimensional case, numerical simulations show that blow-up-like solutions, spatial chaos, and pseudorecurrence can appear at higher laser intensities if only plasma defocusing is included. These complex patterns result from the stochastic evolution of the higher- or shorter-wavelength modes of the laser light spectrum. From the viewpoint of nonlinear dynamics, filamentation can be attributed to the modulational instability of these spatial incoherent localized structures. Furthermore, filament patterns associated with multiphoton ionization of the air molecules with and without higher-order Kerr effects are compared.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Models, Molecular
/
Air
/
Plasma Gases
/
Lasers
/
Models, Chemical
Language:
En
Journal:
Phys Rev E Stat Nonlin Soft Matter Phys
Journal subject:
BIOFISICA
/
FISIOLOGIA
Year:
2013
Document type:
Article