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Double layer effects in laser-ablation plasma plumes

Bulgakova1, Bulgakov, Bobrenok

  • 1Institute of Thermophysics, Lavrentyev Prospect 1, 630090 Novosibirsk, Russia.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

Investigating ion acceleration in laser-induced plasma plumes reveals that increasing laser fluence generates faster ions. This phenomenon is linked to the formation of a double layer, crucial for pulsed laser deposition applications.

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Area of Science:

  • Plasma Physics
  • Laser-Ablation Science
  • Materials Science

Background:

  • Pulsed laser deposition (PLD) relies on understanding ion behavior in laser-induced plasma plumes.
  • Ion acceleration mechanisms in these plumes are critical for controlling deposition quality and material properties.

Purpose of the Study:

  • To investigate ion acceleration in laser-induced plasma plumes.
  • To elucidate the role of laser fluence and wavelength on ion velocity distributions.
  • To explore the formation of self-consistent electric fields, specifically double layers, and their impact on ion acceleration.

Main Methods:

  • Utilized charge-collector probe measurements to analyze ion signals.
  • Employed fundamental (1064 nm) and second (532 nm) harmonics of a Nd:YAG laser for ablation.

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  • Studied ion time-of-flight signals across a laser fluence range of 2-25 J/cm².
  • Examined dependencies on target-to-collector distance, background pressure, and laser wavelength.

    • Main Results:

    • Observed a transition in ion time-of-flight signals from single-peaked to double-peaked and back to single-peaked with increasing laser fluence.
    • Identified accelerated ion populations appearing as a distinct fast peak in velocity distributions at higher fluences.
    • Demonstrated that increasing laser fluence leads to enhanced ion acceleration.

    Conclusions:

    • The observed ion acceleration is attributed to the formation of a self-consistent ambipolar electric field (double layer).
    • The development of a high-energetic electron tail, resulting from laser radiation absorption, is proposed as the mechanism driving double layer formation.
    • These findings provide critical insights into controlling ion dynamics for optimized pulsed laser deposition processes.