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Laser-triggered high-voltage plasma switching with diffractive optics.

M Ekberg1, A Sunesson, M Bergkvist

  • 1ABB Corporate Research, SE-721 78 Västerås, Sweden.

Applied Optics
|March 22, 2008
PubMed
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High-power lasers and diffractive optical elements (DOEs) enable rapid electrical discharge triggering in gases. DOEs offer flexible, efficient switching for high-voltage applications, outperforming traditional methods.

Area of Science:

  • Optics and Photonics
  • Electrical Engineering
  • Plasma Physics

Background:

  • High-power lasers can ionize gases for rapid electrical discharge triggering.
  • Current switching technologies have limitations in speed and design flexibility.
  • Diffractive Optical Elements (DOEs) offer precise laser beam manipulation.

Purpose of the Study:

  • To investigate the use of DOEs for rapid and reliable electrical discharge triggering in gases.
  • To compare two types of DOEs for high-voltage discharge applications.
  • To demonstrate the potential of DOEs in advancing electrical switching technology.

Main Methods:

  • Utilized two distinct DOEs: a diffractive axicon and a multiple-focal-distance kinoform.
  • Directed laser light to create focal regions between high-voltage electrodes in pure argon gas.

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  • Analyzed the characteristics of the electrical discharge triggered by the laser foci.

    • Main Results:

    • The diffractive axicon created an extended, continuous high-intensity focal region.
    • The kinoform generated a linear array of 20 discrete, high-intensity foci.
    • Both DOEs demonstrated efficient and rapid triggering of electrical discharges.

    Conclusions:

    • DOEs provide an effective method for initiating electrical discharges in gases.
    • These optical elements enable faster and more flexible high-voltage switching solutions.
    • DOEs open possibilities for novel electrode configurations and advanced switching devices.