Filamentation of long-wave infrared pulses in the atmosphere [Invited]

Sergei Tochitsky, Eric Welch, Paris Panagiotopoulos, Misha Polyanskiy, Igor Pogorelsky, Miroslav Kolesik, Stephan W. Koch, Jerome V. Moloney, Chan Joshi

Research output: Contribution to journalReview article

Abstract

Filamentation of a high-power laser beam in air opens the possibility of the diffraction-compensated propagation of a laser beam over long distances and as such is being considered for remote stand-off detection, lightning control, free-space communications, and long-range projection of high-energy pulses. Switching to long-wave infrared (LWIR) range for filamentation, as shown in recent experiments, allows for generation of a single centimeter-diameter channel in air that, in comparison with a short-wavelength laser filament, has 4 orders of magnitude larger cross section and guides many joules of pulse energy over multiple Rayleigh distances at a clamped intensity of ∼1012 W/cm2. Self-guiding of LWIR pulses in air arises from the balance between self-focusing, diffraction, and defocusing caused by free carriers generated via many-body Coulomb-induced ionization which effectively decrease the molecular polarizability during the long-wavelength laser pulse. Understanding where this new ionization regime plays a role, below the threshold of the well-adopted single-atom tunnel ionization in gases, could become a new frontier in strong-field interactions. This paper offers an overview of the atmospheric filamentation research at long-wave infrared wavelengths.

Original languageEnglish (US)
Pages (from-to)G40-G51
JournalJournal of the Optical Society of America B: Optical Physics
Volume36
Issue number10
DOIs
StatePublished - Jan 1 2019

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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