Abstract
The birefringence of a linearly polarized femtosecond laser filament in gases has been previously established. In this work, we report the time-dependent refractive index measurements of the filament based upon the spectral modulation of a weak probe pulse in air and in argon gas at 1 atmospheric pressure. The polarization dependence of the refractive index modulation induced by the delayed molecular alignment and by the electronic Kerr effect is highlighted. A numerical simulation of the refractive indices, which takes into account the molecular alignment, the electronic Kerr non-linearity and the plasma, is in good agreement with the measurements.
Original language | English (US) |
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Pages (from-to) | 2732-2736 |
Number of pages | 5 |
Journal | Optics Communications |
Volume | 283 |
Issue number | 13 |
DOIs | |
State | Published - Jul 1 2010 |
Keywords
- Filamentation
- Kerr effect
- Molecular alignment
- Non-linear optics
- Revival
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Physical and Theoretical Chemistry
- Electrical and Electronic Engineering