Generation of long-lived underdense channels using femtosecond filamentation in air

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Generation of long-lived underdense channels using femtosecond filamentation in air

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Femtosecond Laser Filamentation in Air

Femtosecond laser filamentation was excited in air. Measurement of the length of the light filament formed was carried out, using calibration method with an analysis on the precision of the measurement. From the photoemission spectra obtained by optic spectrometer, valuable information on the mechanism of interaction of strong laser pulses with atoms and molecules could be obtained. Furthermore...

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Filamentation of femtosecond light pulses in the air: turbulent cells versus long-range clusters.

The filamentation of ultrashort pulses in air is investigated theoretically and experimentally. From the theoretical point of view, beam propagation is shown to be driven by the interplay between random nucleation of small-scale cells and relaxation to long waveguides. After a transient stage along which they vary in location and in amplitude, filaments triggered by an isotropic noise are confi...

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Rovibrational wave-packet dispersion during femtosecond laser filamentation in air.

An impulsive, femtosecond filament-based Raman technique producing high quality Raman spectra over a broad spectral range (1554.7-4155 cm(-1)) is presented. The temperature of gas phase molecules can be measured by temporally resolving the dispersion of impulsively excited vibrational wave packets. Application to laser-induced filamentation in air reveals that the initial rovibrational temperat...

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Generation of extended plasma channels in air using femtosecond Bessel beams.

Extending the longitudinal range of plasma channels created by ultrashort laser pulses in atmosphere is important in practical applications of laser-induced plasma such as remote spectroscopy and lightning control. Weakly focused femtosecond Gaussian beams that are commonly used for generating plasma channels offer only a limited control of filamentation. Increasing the pulse energy in this cas...

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ژورنال

عنوان ژورنال: Journal of Physics B: Atomic, Molecular and Optical Physics

سال: 2015

ISSN: 0953-4075,1361-6455

DOI: 10.1088/0953-4075/48/9/094009