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Optics Express

Optics Express

  • Editor: Martijn de Sterke
  • Vol. 16, Iss. 20 — Sep. 29, 2008
  • pp: 15733–15740

Generation of extended plasma channels in air using femtosecond Bessel beams

Pavel Polynkin, Miroslav Kolesik, Adam Roberts, Daniele Faccio, Paolo Di Trapani, and Jerome Moloney  »View Author Affiliations


Optics Express, Vol. 16, Issue 20, pp. 15733-15740 (2008)
http://dx.doi.org/10.1364/OE.16.015733


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Abstract

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 case typically results in creation of multiple filaments and does not appreciably extend the longitudinal range of filamentation. Bessel beams with their extended linear foci intuitively appear to be better suited for generation of long plasma channels. We report experimental results on creating extended filaments in air using femtosecond Bessel beams. By probing the linear plasma density along the filament, we show that apertured Bessel beams produce stable single plasma channels that span the entire extent of the linear focus of the beam. We further show that by temporally chirping the pulse, the plasma channel can be longitudinally shifted beyond the linear-focus zone, an important effect that may potentially offer additional means of controlling filament formation.

© 2008 Optical Society of America

OCIS Codes
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.7110) Ultrafast optics : Ultrafast nonlinear optics
(350.5400) Other areas of optics : Plasmas

ToC Category:
Ultrafast Optics

History
Original Manuscript: August 12, 2008
Revised Manuscript: September 17, 2008
Manuscript Accepted: September 18, 2008
Published: September 19, 2008

Citation
Pavel Polynkin, Miroslav Kolesik, Adam Roberts, Daniele Faccio, Paolo Di Trapani, and Jerome Moloney, "Generation of extended plasma channels in air using femtosecond Bessel beams," Opt. Express 16, 15733-15740 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-20-15733


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