Microscopic model for the higher-order nonlinearity in optical filaments
Journal Article
·
· Physical Review. A
- Department of Physics, Constantine the Philosopher University, Nitra (Slovakia)
- College of Optical Sciences, University of Arizona, Tucson, Arizona 85721 (United States)
Using an exactly soluble one-dimensional atomic model, we explore the idea that the recently observed high-order nonlinearity in optical filaments is due to virtual transitions involving the continuum states. We show that the model's behavior is qualitatively comparable with the experimentally observed crossover from self-focusing to defocusing at high intensities, and only occurs at intensities which result in significant ionization. Based on these observations, we conjecture that this continuum electron nonlinear refraction exhibits strong memory effects and, most importantly, the change of its sign is effectively masked by the defocusing due to free electrons.
- OSTI ID:
- 21529014
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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