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- W2922293563 abstract "The challenge of guiding or deflecting a laser beam in a disturbed medium involves carefulconsideration of various nonlinear interactions of light with air and their transient response. Alight filament provides a high intensity region in space that maintain its shape for propagationlengths longer than the Rayleigh range. The possibility to use this light channel for couplingoptical, teraherz and radio frequency had been spurring researches in this field.We present the contribution of transient nonlinear response of the medium on light propagation.The nonlinear interaction of ultrashort pulses with air leaves a spatial distribution of ionized mediumthat evolves into an equilibrium plasma. The light pulse has left the medium it ionized before theplasma has reached equilibrium. Therefore, the reaction of the medium onto the filament involvesa transient evolution of the ensemble of ions and electrons that follow deterministic trajectoriesunder the influence of the light field. Other nonlinear interactions such as molecular alignmentalso have a time dependent response. The relative influence of the plasma and molecular motionis modified by focusing conditions. The standard focusing of light into air combines the nonlinearKerr focusing with the desired linear focusing of the optics. A focusing through a sharp pressuregradient made by an aerodynamic window enhances the pointing stability of the laser beam. Theeffect of transient response of the medium driven by nonlinear interaction of ultrashort pulse onthe guided beam will be discussed." @default.
- W2922293563 created "2019-03-22" @default.
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- W2922293563 date "2019-03-13" @default.
- W2922293563 modified "2023-09-24" @default.
- W2922293563 title "Nonlinear transient properties of laser induced waveguides (Conference Presentation)" @default.
- W2922293563 doi "https://doi.org/10.1117/12.2514633" @default.
- W2922293563 hasPublicationYear "2019" @default.
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