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Related Experiment Videos

Clustered gases as a medium for efficient plasma waveguide generation.

H M Milchberg1, K Y Kim, V Kumarappan

  • 1University of Maryland Institute for Physical Science and Technology College Park, MD 20742, USA.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 18, 2006
PubMed
Summary
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Clustered gas jets efficiently create plasma waveguides for intense laser pulses. These novel waveguides allow for lower plasma density and guided propagation over long distances, improving laser-plasma interactions.

Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • Nanoparticle Science

Background:

  • Conventional plasma waveguides often suffer from high on-axis plasma density.
  • Generating stable plasma channels for intense laser propagation remains a challenge.

Purpose of the Study:

  • To investigate the efficiency of clustered gas jets for plasma waveguide generation.
  • To compare waveguide performance using femtosecond and picosecond laser pulses.
  • To explore laser pulse propagation and energy coupling within these waveguides.

Main Methods:

  • Utilizing femtosecond and picosecond laser pulses to generate plasma waveguides in argon cluster jets.
  • Employing self-guided propagation and strong absorption techniques.
  • Coupling subsequent intense laser pulses into the generated channels.

Related Experiment Videos

  • Using 100 ps axicon-generated Bessel-beam pump pulses for waveguide generation.
  • Performing simulations to understand plasma evolution and heating dynamics.

    • Main Results:

    • Achieved significantly lower on-axis plasma density (< 10^18 cm^-3) compared to conventional methods.
    • Demonstrated self-guided propagation of femtosecond pulses over centimeter scales with >70% absorption.
    • Coupled subsequent intense pulses into the waveguide with 50% efficiency, guiding at >10^17 W cm^-2 over 40 Rayleigh lengths.
    • Observed up to 35% absorption efficiency for long picosecond pulses, despite rapid cluster disassembly.
    • Simulations revealed rapid formation of cool, uniform plasma from heated clusters, enabling efficient heating by the laser pulse.

    Conclusions:

    • Clustered gas jets provide an efficient method for generating low-density plasma waveguides.
    • These waveguides support robust propagation of intense laser pulses over extended lengths.
    • The findings offer a promising pathway for advanced laser-plasma applications requiring controlled plasma channels.