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Title: Effects of higher-order Kerr nonlinearity and plasma diffraction on multiple filamentation of ultrashort laser pulses in air

The effect of higher-order Kerr nonlinearity on channel formation by, and filamentation of, ultrashort laser pulses propagating in air is considered. Filament patterns originating from multiphoton ionization of the air molecules with and without the higher-order Kerr and molecular-rotation effects are investigated. It is found that diverging multiple filaments are formed if only the plasma-induced defocusing effect is included. In the presence of the higher-order Kerr effects, the light channel can exist for a long distance. The effect of noise on the filament patterns is also discussed.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [1] ;  [2]
  1. HEDPS, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China)
  2. (China)
  3. Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China)
Publication Date:
OSTI Identifier:
22227930
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; AIR; DIFFRACTION; KERR EFFECT; LASER-PRODUCED PLASMA; LASERS; MOLECULES; MULTI-PHOTON PROCESSES; NONLINEAR PROBLEMS; PHOTOIONIZATION; PHOTON-MOLECULE COLLISIONS; PLASMA; PLASMA FILAMENT; PULSES; VISIBLE RADIATION