Generation of electromagnetic pulses from plasma channels induced by femtosecond light strings

Chung Chieh Cheng, E. M. Wright, J. V. Moloney

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Summary form only given. Recent investigations of the propagation of high-power femtosecond infrared (IR) laser pulses in air show that the dynamical interaction between nonlinear self-focusing and plasma defocusing causes an initial beam to breakup spatially into several filaments, or light strings, which maintain themselves over long distances via a turbulent optical light guide. It has been observed experimentally that femtosecond light strings in turn produce plasma channels by multi-photon ionization (MPI) along their direction of propagation with lengths ranging from tens of centimeters to several meters, and diameters around a hundred microns. For high-intensity (e.g. 1014 W/cm2) femtosecond IR laser input pulses, MPI is the dominant mechanism of plasma creation. If these channels attain a finite dipole moment then this could explain the recently observed electromagnetic pulse (EMP) from light string induced plasmas. The lifetime of the observed plasma channels is around a nanosecond in keeping with the duration of the observed EMP. One anticipates that the central frequency of the EMP will be related to the plasma frequency of the channel, but the frequency has not been determined experimentally as of yet.

Original languageEnglish (US)
Title of host publicationTechnical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages1
ISBN (Electronic)155752663X, 9781557526632
DOIs
StatePublished - Jan 1 2001
EventQuantum Electronics and Laser Science Conference, QELS 2001 - Baltimore, United States
Duration: May 6 2001May 11 2001

Publication series

NameTechnical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001

Other

OtherQuantum Electronics and Laser Science Conference, QELS 2001
CountryUnited States
CityBaltimore
Period5/6/015/11/01

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiation

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    Cheng, C. C., Wright, E. M., & Moloney, J. V. (2001). Generation of electromagnetic pulses from plasma channels induced by femtosecond light strings. In Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001 [961831] (Technical Digest - Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference, QELS 2001). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/QELS.2001.961831