Directed transfer of microwave radiation in sliding-mode plasma waveguides produced by ultraviolet laser in atmospheric air.

Applied optics · 2014 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 6553

Study snapshot

PublicationApplied optics · 2014

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Experiments have been performed at hybrid Ti:sapphire/KrF laser facility GARPUN-MTW to develop a novel technique to create a hollow-core sliding-mode plasma-filament waveguide for directed transfer of microwave radiation. Efficient multiphoton air ionization was produced by a train of picosecond 1-TW UV pulses at 248 nm wavelength, or by amplitude-modulated 100 ns pulse combining a short-pulse train with a free-running 1-GW pulse, which detached electrons off O2- ions. Multiple filamentation of UV laser radiation in air was observed, and filamentation theory based on resonance-enhanced ionization was developed to explain the experimental results.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Experiments at a hybrid Ti:sapphire/KrF laser facility developed a technique to create a hollow-core sliding-mode plasma-filament waveguide in atmospheric air for directed transfer of microwave radiation. Efficient multiphoton air ionization was achieved using picosecond UV pulses at 248 nm or an amplitude-modulated 100 ns pulse combining a short-pulse train with a free-running pulse, and multiple filamentation was observed with a theory proposed to explain results.

Outcomes measured

Directed transfer of microwave radiation using a hollow-core sliding-mode plasma-filament waveguide in atmospheric air
Multiphoton air ionization and electron detachment mechanisms using UV laser pulses
Observation of multiple filamentation of UV laser radiation in air
Development of filamentation theory based on resonance-enhanced ionization to explain experimental results

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": "microwave",
    "source": "plasma waveguide / directed transfer setup",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Directed transfer of microwave radiation using a hollow-core sliding-mode plasma-filament waveguide in atmospheric air",
    "Multiphoton air ionization and electron detachment mechanisms using UV laser pulses",
    "Observation of multiple filamentation of UV laser radiation in air",
    "Development of filamentation theory based on resonance-enhanced ionization to explain experimental results"
  ],
  "main_findings": "Experiments at a hybrid Ti:sapphire/KrF laser facility developed a technique to create a hollow-core sliding-mode plasma-filament waveguide in atmospheric air for directed transfer of microwave radiation. Efficient multiphoton air ionization was achieved using picosecond UV pulses at 248 nm or an amplitude-modulated 100 ns pulse combining a short-pulse train with a free-running pulse, and multiple filamentation was observed with a theory proposed to explain results.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "plasma waveguide",
    "sliding-mode",
    "plasma filament",
    "ultraviolet laser",
    "air ionization",
    "multiphoton ionization",
    "electron detachment",
    "filamentation",
    "resonance-enhanced ionization"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1364/ao.53.000i31
PubMed: 25402935

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